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_transport.h> 26 #include <target/target_core_tmr.h> 27 #include <target/target_core_fabric_ops.h> 28 #include <target/target_core_configfs.h> 29 30 #include "iscsi_target_core.h" 31 #include "iscsi_target_parameters.h" 32 #include "iscsi_target_seq_pdu_list.h" 33 #include "iscsi_target_datain_values.h" 34 #include "iscsi_target_erl0.h" 35 #include "iscsi_target_erl1.h" 36 #include "iscsi_target_erl2.h" 37 #include "iscsi_target_tpg.h" 38 #include "iscsi_target_tq.h" 39 #include "iscsi_target_util.h" 40 #include "iscsi_target.h" 41 42 #define PRINT_BUFF(buff, len) \ 43 { \ 44 int zzz; \ 45 \ 46 pr_debug("%d:\n", __LINE__); \ 47 for (zzz = 0; zzz < len; zzz++) { \ 48 if (zzz % 16 == 0) { \ 49 if (zzz) \ 50 pr_debug("\n"); \ 51 pr_debug("%4i: ", zzz); \ 52 } \ 53 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \ 54 } \ 55 if ((len + 1) % 16) \ 56 pr_debug("\n"); \ 57 } 58 59 extern struct list_head g_tiqn_list; 60 extern spinlock_t tiqn_lock; 61 62 /* 63 * Called with cmd->r2t_lock held. 64 */ 65 int iscsit_add_r2t_to_list( 66 struct iscsi_cmd *cmd, 67 u32 offset, 68 u32 xfer_len, 69 int recovery, 70 u32 r2t_sn) 71 { 72 struct iscsi_r2t *r2t; 73 74 r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC); 75 if (!r2t) { 76 pr_err("Unable to allocate memory for struct iscsi_r2t.\n"); 77 return -1; 78 } 79 INIT_LIST_HEAD(&r2t->r2t_list); 80 81 r2t->recovery_r2t = recovery; 82 r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn; 83 r2t->offset = offset; 84 r2t->xfer_len = xfer_len; 85 list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list); 86 spin_unlock_bh(&cmd->r2t_lock); 87 88 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T); 89 90 spin_lock_bh(&cmd->r2t_lock); 91 return 0; 92 } 93 94 struct iscsi_r2t *iscsit_get_r2t_for_eos( 95 struct iscsi_cmd *cmd, 96 u32 offset, 97 u32 length) 98 { 99 struct iscsi_r2t *r2t; 100 101 spin_lock_bh(&cmd->r2t_lock); 102 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 103 if ((r2t->offset <= offset) && 104 (r2t->offset + r2t->xfer_len) >= (offset + length)) { 105 spin_unlock_bh(&cmd->r2t_lock); 106 return r2t; 107 } 108 } 109 spin_unlock_bh(&cmd->r2t_lock); 110 111 pr_err("Unable to locate R2T for Offset: %u, Length:" 112 " %u\n", offset, length); 113 return NULL; 114 } 115 116 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd) 117 { 118 struct iscsi_r2t *r2t; 119 120 spin_lock_bh(&cmd->r2t_lock); 121 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 122 if (!r2t->sent_r2t) { 123 spin_unlock_bh(&cmd->r2t_lock); 124 return r2t; 125 } 126 } 127 spin_unlock_bh(&cmd->r2t_lock); 128 129 pr_err("Unable to locate next R2T to send for ITT:" 130 " 0x%08x.\n", cmd->init_task_tag); 131 return NULL; 132 } 133 134 /* 135 * Called with cmd->r2t_lock held. 136 */ 137 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd) 138 { 139 list_del(&r2t->r2t_list); 140 kmem_cache_free(lio_r2t_cache, r2t); 141 } 142 143 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd) 144 { 145 struct iscsi_r2t *r2t, *r2t_tmp; 146 147 spin_lock_bh(&cmd->r2t_lock); 148 list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list) 149 iscsit_free_r2t(r2t, cmd); 150 spin_unlock_bh(&cmd->r2t_lock); 151 } 152 153 /* 154 * May be called from software interrupt (timer) context for allocating 155 * iSCSI NopINs. 156 */ 157 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, gfp_t gfp_mask) 158 { 159 struct iscsi_cmd *cmd; 160 161 cmd = kmem_cache_zalloc(lio_cmd_cache, gfp_mask); 162 if (!cmd) { 163 pr_err("Unable to allocate memory for struct iscsi_cmd.\n"); 164 return NULL; 165 } 166 167 cmd->conn = conn; 168 INIT_LIST_HEAD(&cmd->i_list); 169 INIT_LIST_HEAD(&cmd->datain_list); 170 INIT_LIST_HEAD(&cmd->cmd_r2t_list); 171 init_completion(&cmd->reject_comp); 172 spin_lock_init(&cmd->datain_lock); 173 spin_lock_init(&cmd->dataout_timeout_lock); 174 spin_lock_init(&cmd->istate_lock); 175 spin_lock_init(&cmd->error_lock); 176 spin_lock_init(&cmd->r2t_lock); 177 178 return cmd; 179 } 180 181 /* 182 * Called from iscsi_handle_scsi_cmd() 183 */ 184 struct iscsi_cmd *iscsit_allocate_se_cmd( 185 struct iscsi_conn *conn, 186 u32 data_length, 187 int data_direction, 188 int iscsi_task_attr) 189 { 190 struct iscsi_cmd *cmd; 191 struct se_cmd *se_cmd; 192 int sam_task_attr; 193 194 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 195 if (!cmd) 196 return NULL; 197 198 cmd->data_direction = data_direction; 199 cmd->data_length = data_length; 200 /* 201 * Figure out the SAM Task Attribute for the incoming SCSI CDB 202 */ 203 if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) || 204 (iscsi_task_attr == ISCSI_ATTR_SIMPLE)) 205 sam_task_attr = MSG_SIMPLE_TAG; 206 else if (iscsi_task_attr == ISCSI_ATTR_ORDERED) 207 sam_task_attr = MSG_ORDERED_TAG; 208 else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE) 209 sam_task_attr = MSG_HEAD_TAG; 210 else if (iscsi_task_attr == ISCSI_ATTR_ACA) 211 sam_task_attr = MSG_ACA_TAG; 212 else { 213 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using" 214 " MSG_SIMPLE_TAG\n", iscsi_task_attr); 215 sam_task_attr = MSG_SIMPLE_TAG; 216 } 217 218 se_cmd = &cmd->se_cmd; 219 /* 220 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 221 */ 222 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops, 223 conn->sess->se_sess, data_length, data_direction, 224 sam_task_attr, &cmd->sense_buffer[0]); 225 return cmd; 226 } 227 228 struct iscsi_cmd *iscsit_allocate_se_cmd_for_tmr( 229 struct iscsi_conn *conn, 230 u8 function) 231 { 232 struct iscsi_cmd *cmd; 233 struct se_cmd *se_cmd; 234 u8 tcm_function; 235 236 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL); 237 if (!cmd) 238 return NULL; 239 240 cmd->data_direction = DMA_NONE; 241 242 cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL); 243 if (!cmd->tmr_req) { 244 pr_err("Unable to allocate memory for" 245 " Task Management command!\n"); 246 goto out; 247 } 248 /* 249 * TASK_REASSIGN for ERL=2 / connection stays inside of 250 * LIO-Target $FABRIC_MOD 251 */ 252 if (function == ISCSI_TM_FUNC_TASK_REASSIGN) 253 return cmd; 254 255 se_cmd = &cmd->se_cmd; 256 /* 257 * Initialize struct se_cmd descriptor from target_core_mod infrastructure 258 */ 259 transport_init_se_cmd(se_cmd, &lio_target_fabric_configfs->tf_ops, 260 conn->sess->se_sess, 0, DMA_NONE, 261 MSG_SIMPLE_TAG, &cmd->sense_buffer[0]); 262 263 switch (function) { 264 case ISCSI_TM_FUNC_ABORT_TASK: 265 tcm_function = TMR_ABORT_TASK; 266 break; 267 case ISCSI_TM_FUNC_ABORT_TASK_SET: 268 tcm_function = TMR_ABORT_TASK_SET; 269 break; 270 case ISCSI_TM_FUNC_CLEAR_ACA: 271 tcm_function = TMR_CLEAR_ACA; 272 break; 273 case ISCSI_TM_FUNC_CLEAR_TASK_SET: 274 tcm_function = TMR_CLEAR_TASK_SET; 275 break; 276 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET: 277 tcm_function = TMR_LUN_RESET; 278 break; 279 case ISCSI_TM_FUNC_TARGET_WARM_RESET: 280 tcm_function = TMR_TARGET_WARM_RESET; 281 break; 282 case ISCSI_TM_FUNC_TARGET_COLD_RESET: 283 tcm_function = TMR_TARGET_COLD_RESET; 284 break; 285 default: 286 pr_err("Unknown iSCSI TMR Function:" 287 " 0x%02x\n", function); 288 goto out; 289 } 290 291 se_cmd->se_tmr_req = core_tmr_alloc_req(se_cmd, 292 (void *)cmd->tmr_req, tcm_function); 293 if (!se_cmd->se_tmr_req) 294 goto out; 295 296 cmd->tmr_req->se_tmr_req = se_cmd->se_tmr_req; 297 298 return cmd; 299 out: 300 iscsit_release_cmd(cmd); 301 return NULL; 302 } 303 304 int iscsit_decide_list_to_build( 305 struct iscsi_cmd *cmd, 306 u32 immediate_data_length) 307 { 308 struct iscsi_build_list bl; 309 struct iscsi_conn *conn = cmd->conn; 310 struct iscsi_session *sess = conn->sess; 311 struct iscsi_node_attrib *na; 312 313 if (sess->sess_ops->DataSequenceInOrder && 314 sess->sess_ops->DataPDUInOrder) 315 return 0; 316 317 if (cmd->data_direction == DMA_NONE) 318 return 0; 319 320 na = iscsit_tpg_get_node_attrib(sess); 321 memset(&bl, 0, sizeof(struct iscsi_build_list)); 322 323 if (cmd->data_direction == DMA_FROM_DEVICE) { 324 bl.data_direction = ISCSI_PDU_READ; 325 bl.type = PDULIST_NORMAL; 326 if (na->random_datain_pdu_offsets) 327 bl.randomize |= RANDOM_DATAIN_PDU_OFFSETS; 328 if (na->random_datain_seq_offsets) 329 bl.randomize |= RANDOM_DATAIN_SEQ_OFFSETS; 330 } else { 331 bl.data_direction = ISCSI_PDU_WRITE; 332 bl.immediate_data_length = immediate_data_length; 333 if (na->random_r2t_offsets) 334 bl.randomize |= RANDOM_R2T_OFFSETS; 335 336 if (!cmd->immediate_data && !cmd->unsolicited_data) 337 bl.type = PDULIST_NORMAL; 338 else if (cmd->immediate_data && !cmd->unsolicited_data) 339 bl.type = PDULIST_IMMEDIATE; 340 else if (!cmd->immediate_data && cmd->unsolicited_data) 341 bl.type = PDULIST_UNSOLICITED; 342 else if (cmd->immediate_data && cmd->unsolicited_data) 343 bl.type = PDULIST_IMMEDIATE_AND_UNSOLICITED; 344 } 345 346 return iscsit_do_build_list(cmd, &bl); 347 } 348 349 struct iscsi_seq *iscsit_get_seq_holder_for_datain( 350 struct iscsi_cmd *cmd, 351 u32 seq_send_order) 352 { 353 u32 i; 354 355 for (i = 0; i < cmd->seq_count; i++) 356 if (cmd->seq_list[i].seq_send_order == seq_send_order) 357 return &cmd->seq_list[i]; 358 359 return NULL; 360 } 361 362 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd) 363 { 364 u32 i; 365 366 if (!cmd->seq_list) { 367 pr_err("struct iscsi_cmd->seq_list is NULL!\n"); 368 return NULL; 369 } 370 371 for (i = 0; i < cmd->seq_count; i++) { 372 if (cmd->seq_list[i].type != SEQTYPE_NORMAL) 373 continue; 374 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) { 375 cmd->seq_send_order++; 376 return &cmd->seq_list[i]; 377 } 378 } 379 380 return NULL; 381 } 382 383 struct iscsi_r2t *iscsit_get_holder_for_r2tsn( 384 struct iscsi_cmd *cmd, 385 u32 r2t_sn) 386 { 387 struct iscsi_r2t *r2t; 388 389 spin_lock_bh(&cmd->r2t_lock); 390 list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) { 391 if (r2t->r2t_sn == r2t_sn) { 392 spin_unlock_bh(&cmd->r2t_lock); 393 return r2t; 394 } 395 } 396 spin_unlock_bh(&cmd->r2t_lock); 397 398 return NULL; 399 } 400 401 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn) 402 { 403 int ret; 404 405 /* 406 * This is the proper method of checking received CmdSN against 407 * ExpCmdSN and MaxCmdSN values, as well as accounting for out 408 * or order CmdSNs due to multiple connection sessions and/or 409 * CRC failures. 410 */ 411 if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) { 412 pr_err("Received CmdSN: 0x%08x is greater than" 413 " MaxCmdSN: 0x%08x, protocol error.\n", cmdsn, 414 sess->max_cmd_sn); 415 ret = CMDSN_ERROR_CANNOT_RECOVER; 416 417 } else if (cmdsn == sess->exp_cmd_sn) { 418 sess->exp_cmd_sn++; 419 pr_debug("Received CmdSN matches ExpCmdSN," 420 " incremented ExpCmdSN to: 0x%08x\n", 421 sess->exp_cmd_sn); 422 ret = CMDSN_NORMAL_OPERATION; 423 424 } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) { 425 pr_debug("Received CmdSN: 0x%08x is greater" 426 " than ExpCmdSN: 0x%08x, not acknowledging.\n", 427 cmdsn, sess->exp_cmd_sn); 428 ret = CMDSN_HIGHER_THAN_EXP; 429 430 } else { 431 pr_err("Received CmdSN: 0x%08x is less than" 432 " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn, 433 sess->exp_cmd_sn); 434 ret = CMDSN_LOWER_THAN_EXP; 435 } 436 437 return ret; 438 } 439 440 /* 441 * Commands may be received out of order if MC/S is in use. 442 * Ensure they are executed in CmdSN order. 443 */ 444 int iscsit_sequence_cmd( 445 struct iscsi_conn *conn, 446 struct iscsi_cmd *cmd, 447 u32 cmdsn) 448 { 449 int ret; 450 int cmdsn_ret; 451 452 mutex_lock(&conn->sess->cmdsn_mutex); 453 454 cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, cmdsn); 455 switch (cmdsn_ret) { 456 case CMDSN_NORMAL_OPERATION: 457 ret = iscsit_execute_cmd(cmd, 0); 458 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list)) 459 iscsit_execute_ooo_cmdsns(conn->sess); 460 break; 461 case CMDSN_HIGHER_THAN_EXP: 462 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, cmdsn); 463 break; 464 case CMDSN_LOWER_THAN_EXP: 465 cmd->i_state = ISTATE_REMOVE; 466 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state); 467 ret = cmdsn_ret; 468 break; 469 default: 470 ret = cmdsn_ret; 471 break; 472 } 473 mutex_unlock(&conn->sess->cmdsn_mutex); 474 475 return ret; 476 } 477 478 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf) 479 { 480 struct iscsi_conn *conn = cmd->conn; 481 struct se_cmd *se_cmd = &cmd->se_cmd; 482 struct iscsi_data *hdr = (struct iscsi_data *) buf; 483 u32 payload_length = ntoh24(hdr->dlength); 484 485 if (conn->sess->sess_ops->InitialR2T) { 486 pr_err("Received unexpected unsolicited data" 487 " while InitialR2T=Yes, protocol error.\n"); 488 transport_send_check_condition_and_sense(se_cmd, 489 TCM_UNEXPECTED_UNSOLICITED_DATA, 0); 490 return -1; 491 } 492 493 if ((cmd->first_burst_len + payload_length) > 494 conn->sess->sess_ops->FirstBurstLength) { 495 pr_err("Total %u bytes exceeds FirstBurstLength: %u" 496 " for this Unsolicited DataOut Burst.\n", 497 (cmd->first_burst_len + payload_length), 498 conn->sess->sess_ops->FirstBurstLength); 499 transport_send_check_condition_and_sense(se_cmd, 500 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 501 return -1; 502 } 503 504 if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) 505 return 0; 506 507 if (((cmd->first_burst_len + payload_length) != cmd->data_length) && 508 ((cmd->first_burst_len + payload_length) != 509 conn->sess->sess_ops->FirstBurstLength)) { 510 pr_err("Unsolicited non-immediate data received %u" 511 " does not equal FirstBurstLength: %u, and does" 512 " not equal ExpXferLen %u.\n", 513 (cmd->first_burst_len + payload_length), 514 conn->sess->sess_ops->FirstBurstLength, cmd->data_length); 515 transport_send_check_condition_and_sense(se_cmd, 516 TCM_INCORRECT_AMOUNT_OF_DATA, 0); 517 return -1; 518 } 519 return 0; 520 } 521 522 struct iscsi_cmd *iscsit_find_cmd_from_itt( 523 struct iscsi_conn *conn, 524 u32 init_task_tag) 525 { 526 struct iscsi_cmd *cmd; 527 528 spin_lock_bh(&conn->cmd_lock); 529 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { 530 if (cmd->init_task_tag == init_task_tag) { 531 spin_unlock_bh(&conn->cmd_lock); 532 return cmd; 533 } 534 } 535 spin_unlock_bh(&conn->cmd_lock); 536 537 pr_err("Unable to locate ITT: 0x%08x on CID: %hu", 538 init_task_tag, conn->cid); 539 return NULL; 540 } 541 542 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( 543 struct iscsi_conn *conn, 544 u32 init_task_tag, 545 u32 length) 546 { 547 struct iscsi_cmd *cmd; 548 549 spin_lock_bh(&conn->cmd_lock); 550 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { 551 if (cmd->init_task_tag == init_task_tag) { 552 spin_unlock_bh(&conn->cmd_lock); 553 return cmd; 554 } 555 } 556 spin_unlock_bh(&conn->cmd_lock); 557 558 pr_err("Unable to locate ITT: 0x%08x on CID: %hu," 559 " dumping payload\n", init_task_tag, conn->cid); 560 if (length) 561 iscsit_dump_data_payload(conn, length, 1); 562 563 return NULL; 564 } 565 566 struct iscsi_cmd *iscsit_find_cmd_from_ttt( 567 struct iscsi_conn *conn, 568 u32 targ_xfer_tag) 569 { 570 struct iscsi_cmd *cmd = NULL; 571 572 spin_lock_bh(&conn->cmd_lock); 573 list_for_each_entry(cmd, &conn->conn_cmd_list, i_list) { 574 if (cmd->targ_xfer_tag == targ_xfer_tag) { 575 spin_unlock_bh(&conn->cmd_lock); 576 return cmd; 577 } 578 } 579 spin_unlock_bh(&conn->cmd_lock); 580 581 pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n", 582 targ_xfer_tag, conn->cid); 583 return NULL; 584 } 585 586 int iscsit_find_cmd_for_recovery( 587 struct iscsi_session *sess, 588 struct iscsi_cmd **cmd_ptr, 589 struct iscsi_conn_recovery **cr_ptr, 590 u32 init_task_tag) 591 { 592 struct iscsi_cmd *cmd = NULL; 593 struct iscsi_conn_recovery *cr; 594 /* 595 * Scan through the inactive connection recovery list's command list. 596 * If init_task_tag matches the command is still alligent. 597 */ 598 spin_lock(&sess->cr_i_lock); 599 list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) { 600 spin_lock(&cr->conn_recovery_cmd_lock); 601 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) { 602 if (cmd->init_task_tag == init_task_tag) { 603 spin_unlock(&cr->conn_recovery_cmd_lock); 604 spin_unlock(&sess->cr_i_lock); 605 606 *cr_ptr = cr; 607 *cmd_ptr = cmd; 608 return -2; 609 } 610 } 611 spin_unlock(&cr->conn_recovery_cmd_lock); 612 } 613 spin_unlock(&sess->cr_i_lock); 614 /* 615 * Scan through the active connection recovery list's command list. 616 * If init_task_tag matches the command is ready to be reassigned. 617 */ 618 spin_lock(&sess->cr_a_lock); 619 list_for_each_entry(cr, &sess->cr_active_list, cr_list) { 620 spin_lock(&cr->conn_recovery_cmd_lock); 621 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_list) { 622 if (cmd->init_task_tag == init_task_tag) { 623 spin_unlock(&cr->conn_recovery_cmd_lock); 624 spin_unlock(&sess->cr_a_lock); 625 626 *cr_ptr = cr; 627 *cmd_ptr = cmd; 628 return 0; 629 } 630 } 631 spin_unlock(&cr->conn_recovery_cmd_lock); 632 } 633 spin_unlock(&sess->cr_a_lock); 634 635 return -1; 636 } 637 638 void iscsit_add_cmd_to_immediate_queue( 639 struct iscsi_cmd *cmd, 640 struct iscsi_conn *conn, 641 u8 state) 642 { 643 struct iscsi_queue_req *qr; 644 645 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 646 if (!qr) { 647 pr_err("Unable to allocate memory for" 648 " struct iscsi_queue_req\n"); 649 return; 650 } 651 INIT_LIST_HEAD(&qr->qr_list); 652 qr->cmd = cmd; 653 qr->state = state; 654 655 spin_lock_bh(&conn->immed_queue_lock); 656 list_add_tail(&qr->qr_list, &conn->immed_queue_list); 657 atomic_inc(&cmd->immed_queue_count); 658 atomic_set(&conn->check_immediate_queue, 1); 659 spin_unlock_bh(&conn->immed_queue_lock); 660 661 wake_up_process(conn->thread_set->tx_thread); 662 } 663 664 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn) 665 { 666 struct iscsi_queue_req *qr; 667 668 spin_lock_bh(&conn->immed_queue_lock); 669 if (list_empty(&conn->immed_queue_list)) { 670 spin_unlock_bh(&conn->immed_queue_lock); 671 return NULL; 672 } 673 list_for_each_entry(qr, &conn->immed_queue_list, qr_list) 674 break; 675 676 list_del(&qr->qr_list); 677 if (qr->cmd) 678 atomic_dec(&qr->cmd->immed_queue_count); 679 spin_unlock_bh(&conn->immed_queue_lock); 680 681 return qr; 682 } 683 684 static void iscsit_remove_cmd_from_immediate_queue( 685 struct iscsi_cmd *cmd, 686 struct iscsi_conn *conn) 687 { 688 struct iscsi_queue_req *qr, *qr_tmp; 689 690 spin_lock_bh(&conn->immed_queue_lock); 691 if (!atomic_read(&cmd->immed_queue_count)) { 692 spin_unlock_bh(&conn->immed_queue_lock); 693 return; 694 } 695 696 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 697 if (qr->cmd != cmd) 698 continue; 699 700 atomic_dec(&qr->cmd->immed_queue_count); 701 list_del(&qr->qr_list); 702 kmem_cache_free(lio_qr_cache, qr); 703 } 704 spin_unlock_bh(&conn->immed_queue_lock); 705 706 if (atomic_read(&cmd->immed_queue_count)) { 707 pr_err("ITT: 0x%08x immed_queue_count: %d\n", 708 cmd->init_task_tag, 709 atomic_read(&cmd->immed_queue_count)); 710 } 711 } 712 713 void iscsit_add_cmd_to_response_queue( 714 struct iscsi_cmd *cmd, 715 struct iscsi_conn *conn, 716 u8 state) 717 { 718 struct iscsi_queue_req *qr; 719 720 qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC); 721 if (!qr) { 722 pr_err("Unable to allocate memory for" 723 " struct iscsi_queue_req\n"); 724 return; 725 } 726 INIT_LIST_HEAD(&qr->qr_list); 727 qr->cmd = cmd; 728 qr->state = state; 729 730 spin_lock_bh(&conn->response_queue_lock); 731 list_add_tail(&qr->qr_list, &conn->response_queue_list); 732 atomic_inc(&cmd->response_queue_count); 733 spin_unlock_bh(&conn->response_queue_lock); 734 735 wake_up_process(conn->thread_set->tx_thread); 736 } 737 738 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn) 739 { 740 struct iscsi_queue_req *qr; 741 742 spin_lock_bh(&conn->response_queue_lock); 743 if (list_empty(&conn->response_queue_list)) { 744 spin_unlock_bh(&conn->response_queue_lock); 745 return NULL; 746 } 747 748 list_for_each_entry(qr, &conn->response_queue_list, qr_list) 749 break; 750 751 list_del(&qr->qr_list); 752 if (qr->cmd) 753 atomic_dec(&qr->cmd->response_queue_count); 754 spin_unlock_bh(&conn->response_queue_lock); 755 756 return qr; 757 } 758 759 static void iscsit_remove_cmd_from_response_queue( 760 struct iscsi_cmd *cmd, 761 struct iscsi_conn *conn) 762 { 763 struct iscsi_queue_req *qr, *qr_tmp; 764 765 spin_lock_bh(&conn->response_queue_lock); 766 if (!atomic_read(&cmd->response_queue_count)) { 767 spin_unlock_bh(&conn->response_queue_lock); 768 return; 769 } 770 771 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 772 qr_list) { 773 if (qr->cmd != cmd) 774 continue; 775 776 atomic_dec(&qr->cmd->response_queue_count); 777 list_del(&qr->qr_list); 778 kmem_cache_free(lio_qr_cache, qr); 779 } 780 spin_unlock_bh(&conn->response_queue_lock); 781 782 if (atomic_read(&cmd->response_queue_count)) { 783 pr_err("ITT: 0x%08x response_queue_count: %d\n", 784 cmd->init_task_tag, 785 atomic_read(&cmd->response_queue_count)); 786 } 787 } 788 789 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn) 790 { 791 struct iscsi_queue_req *qr, *qr_tmp; 792 793 spin_lock_bh(&conn->immed_queue_lock); 794 list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) { 795 list_del(&qr->qr_list); 796 if (qr->cmd) 797 atomic_dec(&qr->cmd->immed_queue_count); 798 799 kmem_cache_free(lio_qr_cache, qr); 800 } 801 spin_unlock_bh(&conn->immed_queue_lock); 802 803 spin_lock_bh(&conn->response_queue_lock); 804 list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list, 805 qr_list) { 806 list_del(&qr->qr_list); 807 if (qr->cmd) 808 atomic_dec(&qr->cmd->response_queue_count); 809 810 kmem_cache_free(lio_qr_cache, qr); 811 } 812 spin_unlock_bh(&conn->response_queue_lock); 813 } 814 815 void iscsit_release_cmd(struct iscsi_cmd *cmd) 816 { 817 struct iscsi_conn *conn = cmd->conn; 818 int i; 819 820 iscsit_free_r2ts_from_list(cmd); 821 iscsit_free_all_datain_reqs(cmd); 822 823 kfree(cmd->buf_ptr); 824 kfree(cmd->pdu_list); 825 kfree(cmd->seq_list); 826 kfree(cmd->tmr_req); 827 kfree(cmd->iov_data); 828 829 for (i = 0; i < cmd->t_mem_sg_nents; i++) 830 __free_page(sg_page(&cmd->t_mem_sg[i])); 831 832 kfree(cmd->t_mem_sg); 833 834 if (conn) { 835 iscsit_remove_cmd_from_immediate_queue(cmd, conn); 836 iscsit_remove_cmd_from_response_queue(cmd, conn); 837 } 838 839 kmem_cache_free(lio_cmd_cache, cmd); 840 } 841 842 int iscsit_check_session_usage_count(struct iscsi_session *sess) 843 { 844 spin_lock_bh(&sess->session_usage_lock); 845 if (sess->session_usage_count != 0) { 846 sess->session_waiting_on_uc = 1; 847 spin_unlock_bh(&sess->session_usage_lock); 848 if (in_interrupt()) 849 return 2; 850 851 wait_for_completion(&sess->session_waiting_on_uc_comp); 852 return 1; 853 } 854 spin_unlock_bh(&sess->session_usage_lock); 855 856 return 0; 857 } 858 859 void iscsit_dec_session_usage_count(struct iscsi_session *sess) 860 { 861 spin_lock_bh(&sess->session_usage_lock); 862 sess->session_usage_count--; 863 864 if (!sess->session_usage_count && sess->session_waiting_on_uc) 865 complete(&sess->session_waiting_on_uc_comp); 866 867 spin_unlock_bh(&sess->session_usage_lock); 868 } 869 870 void iscsit_inc_session_usage_count(struct iscsi_session *sess) 871 { 872 spin_lock_bh(&sess->session_usage_lock); 873 sess->session_usage_count++; 874 spin_unlock_bh(&sess->session_usage_lock); 875 } 876 877 /* 878 * Setup conn->if_marker and conn->of_marker values based upon 879 * the initial marker-less interval. (see iSCSI v19 A.2) 880 */ 881 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn) 882 { 883 int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0; 884 /* 885 * IFMarkInt and OFMarkInt are negotiated as 32-bit words. 886 */ 887 u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4); 888 u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4); 889 890 if (conn->conn_ops->OFMarker) { 891 /* 892 * Account for the first Login Command received not 893 * via iscsi_recv_msg(). 894 */ 895 conn->of_marker += ISCSI_HDR_LEN; 896 if (conn->of_marker <= OFMarkInt) { 897 conn->of_marker = (OFMarkInt - conn->of_marker); 898 } else { 899 login_ofmarker_count = (conn->of_marker / OFMarkInt); 900 next_marker = (OFMarkInt * (login_ofmarker_count + 1)) + 901 (login_ofmarker_count * MARKER_SIZE); 902 conn->of_marker = (next_marker - conn->of_marker); 903 } 904 conn->of_marker_offset = 0; 905 pr_debug("Setting OFMarker value to %u based on Initial" 906 " Markerless Interval.\n", conn->of_marker); 907 } 908 909 if (conn->conn_ops->IFMarker) { 910 if (conn->if_marker <= IFMarkInt) { 911 conn->if_marker = (IFMarkInt - conn->if_marker); 912 } else { 913 login_ifmarker_count = (conn->if_marker / IFMarkInt); 914 next_marker = (IFMarkInt * (login_ifmarker_count + 1)) + 915 (login_ifmarker_count * MARKER_SIZE); 916 conn->if_marker = (next_marker - conn->if_marker); 917 } 918 pr_debug("Setting IFMarker value to %u based on Initial" 919 " Markerless Interval.\n", conn->if_marker); 920 } 921 922 return 0; 923 } 924 925 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid) 926 { 927 struct iscsi_conn *conn; 928 929 spin_lock_bh(&sess->conn_lock); 930 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 931 if ((conn->cid == cid) && 932 (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) { 933 iscsit_inc_conn_usage_count(conn); 934 spin_unlock_bh(&sess->conn_lock); 935 return conn; 936 } 937 } 938 spin_unlock_bh(&sess->conn_lock); 939 940 return NULL; 941 } 942 943 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid) 944 { 945 struct iscsi_conn *conn; 946 947 spin_lock_bh(&sess->conn_lock); 948 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { 949 if (conn->cid == cid) { 950 iscsit_inc_conn_usage_count(conn); 951 spin_lock(&conn->state_lock); 952 atomic_set(&conn->connection_wait_rcfr, 1); 953 spin_unlock(&conn->state_lock); 954 spin_unlock_bh(&sess->conn_lock); 955 return conn; 956 } 957 } 958 spin_unlock_bh(&sess->conn_lock); 959 960 return NULL; 961 } 962 963 void iscsit_check_conn_usage_count(struct iscsi_conn *conn) 964 { 965 spin_lock_bh(&conn->conn_usage_lock); 966 if (conn->conn_usage_count != 0) { 967 conn->conn_waiting_on_uc = 1; 968 spin_unlock_bh(&conn->conn_usage_lock); 969 970 wait_for_completion(&conn->conn_waiting_on_uc_comp); 971 return; 972 } 973 spin_unlock_bh(&conn->conn_usage_lock); 974 } 975 976 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn) 977 { 978 spin_lock_bh(&conn->conn_usage_lock); 979 conn->conn_usage_count--; 980 981 if (!conn->conn_usage_count && conn->conn_waiting_on_uc) 982 complete(&conn->conn_waiting_on_uc_comp); 983 984 spin_unlock_bh(&conn->conn_usage_lock); 985 } 986 987 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn) 988 { 989 spin_lock_bh(&conn->conn_usage_lock); 990 conn->conn_usage_count++; 991 spin_unlock_bh(&conn->conn_usage_lock); 992 } 993 994 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response) 995 { 996 u8 state; 997 struct iscsi_cmd *cmd; 998 999 cmd = iscsit_allocate_cmd(conn, GFP_ATOMIC); 1000 if (!cmd) 1001 return -1; 1002 1003 cmd->iscsi_opcode = ISCSI_OP_NOOP_IN; 1004 state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE : 1005 ISTATE_SEND_NOPIN_NO_RESPONSE; 1006 cmd->init_task_tag = 0xFFFFFFFF; 1007 spin_lock_bh(&conn->sess->ttt_lock); 1008 cmd->targ_xfer_tag = (want_response) ? conn->sess->targ_xfer_tag++ : 1009 0xFFFFFFFF; 1010 if (want_response && (cmd->targ_xfer_tag == 0xFFFFFFFF)) 1011 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++; 1012 spin_unlock_bh(&conn->sess->ttt_lock); 1013 1014 spin_lock_bh(&conn->cmd_lock); 1015 list_add_tail(&cmd->i_list, &conn->conn_cmd_list); 1016 spin_unlock_bh(&conn->cmd_lock); 1017 1018 if (want_response) 1019 iscsit_start_nopin_response_timer(conn); 1020 iscsit_add_cmd_to_immediate_queue(cmd, conn, state); 1021 1022 return 0; 1023 } 1024 1025 static void iscsit_handle_nopin_response_timeout(unsigned long data) 1026 { 1027 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1028 1029 iscsit_inc_conn_usage_count(conn); 1030 1031 spin_lock_bh(&conn->nopin_timer_lock); 1032 if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) { 1033 spin_unlock_bh(&conn->nopin_timer_lock); 1034 iscsit_dec_conn_usage_count(conn); 1035 return; 1036 } 1037 1038 pr_debug("Did not receive response to NOPIN on CID: %hu on" 1039 " SID: %u, failing connection.\n", conn->cid, 1040 conn->sess->sid); 1041 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1042 spin_unlock_bh(&conn->nopin_timer_lock); 1043 1044 { 1045 struct iscsi_portal_group *tpg = conn->sess->tpg; 1046 struct iscsi_tiqn *tiqn = tpg->tpg_tiqn; 1047 1048 if (tiqn) { 1049 spin_lock_bh(&tiqn->sess_err_stats.lock); 1050 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name, 1051 (void *)conn->sess->sess_ops->InitiatorName); 1052 tiqn->sess_err_stats.last_sess_failure_type = 1053 ISCSI_SESS_ERR_CXN_TIMEOUT; 1054 tiqn->sess_err_stats.cxn_timeout_errors++; 1055 conn->sess->conn_timeout_errors++; 1056 spin_unlock_bh(&tiqn->sess_err_stats.lock); 1057 } 1058 } 1059 1060 iscsit_cause_connection_reinstatement(conn, 0); 1061 iscsit_dec_conn_usage_count(conn); 1062 } 1063 1064 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn) 1065 { 1066 struct iscsi_session *sess = conn->sess; 1067 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1068 1069 spin_lock_bh(&conn->nopin_timer_lock); 1070 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1071 spin_unlock_bh(&conn->nopin_timer_lock); 1072 return; 1073 } 1074 1075 mod_timer(&conn->nopin_response_timer, 1076 (get_jiffies_64() + na->nopin_response_timeout * HZ)); 1077 spin_unlock_bh(&conn->nopin_timer_lock); 1078 } 1079 1080 /* 1081 * Called with conn->nopin_timer_lock held. 1082 */ 1083 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn) 1084 { 1085 struct iscsi_session *sess = conn->sess; 1086 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1087 1088 spin_lock_bh(&conn->nopin_timer_lock); 1089 if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) { 1090 spin_unlock_bh(&conn->nopin_timer_lock); 1091 return; 1092 } 1093 1094 init_timer(&conn->nopin_response_timer); 1095 conn->nopin_response_timer.expires = 1096 (get_jiffies_64() + na->nopin_response_timeout * HZ); 1097 conn->nopin_response_timer.data = (unsigned long)conn; 1098 conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout; 1099 conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP; 1100 conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING; 1101 add_timer(&conn->nopin_response_timer); 1102 1103 pr_debug("Started NOPIN Response Timer on CID: %d to %u" 1104 " seconds\n", conn->cid, na->nopin_response_timeout); 1105 spin_unlock_bh(&conn->nopin_timer_lock); 1106 } 1107 1108 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn) 1109 { 1110 spin_lock_bh(&conn->nopin_timer_lock); 1111 if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) { 1112 spin_unlock_bh(&conn->nopin_timer_lock); 1113 return; 1114 } 1115 conn->nopin_response_timer_flags |= ISCSI_TF_STOP; 1116 spin_unlock_bh(&conn->nopin_timer_lock); 1117 1118 del_timer_sync(&conn->nopin_response_timer); 1119 1120 spin_lock_bh(&conn->nopin_timer_lock); 1121 conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING; 1122 spin_unlock_bh(&conn->nopin_timer_lock); 1123 } 1124 1125 static void iscsit_handle_nopin_timeout(unsigned long data) 1126 { 1127 struct iscsi_conn *conn = (struct iscsi_conn *) data; 1128 1129 iscsit_inc_conn_usage_count(conn); 1130 1131 spin_lock_bh(&conn->nopin_timer_lock); 1132 if (conn->nopin_timer_flags & ISCSI_TF_STOP) { 1133 spin_unlock_bh(&conn->nopin_timer_lock); 1134 iscsit_dec_conn_usage_count(conn); 1135 return; 1136 } 1137 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1138 spin_unlock_bh(&conn->nopin_timer_lock); 1139 1140 iscsit_add_nopin(conn, 1); 1141 iscsit_dec_conn_usage_count(conn); 1142 } 1143 1144 /* 1145 * Called with conn->nopin_timer_lock held. 1146 */ 1147 void __iscsit_start_nopin_timer(struct iscsi_conn *conn) 1148 { 1149 struct iscsi_session *sess = conn->sess; 1150 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1151 /* 1152 * NOPIN timeout is disabled. 1153 */ 1154 if (!na->nopin_timeout) 1155 return; 1156 1157 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) 1158 return; 1159 1160 init_timer(&conn->nopin_timer); 1161 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1162 conn->nopin_timer.data = (unsigned long)conn; 1163 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1164 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1165 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1166 add_timer(&conn->nopin_timer); 1167 1168 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1169 " interval\n", conn->cid, na->nopin_timeout); 1170 } 1171 1172 void iscsit_start_nopin_timer(struct iscsi_conn *conn) 1173 { 1174 struct iscsi_session *sess = conn->sess; 1175 struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess); 1176 /* 1177 * NOPIN timeout is disabled.. 1178 */ 1179 if (!na->nopin_timeout) 1180 return; 1181 1182 spin_lock_bh(&conn->nopin_timer_lock); 1183 if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) { 1184 spin_unlock_bh(&conn->nopin_timer_lock); 1185 return; 1186 } 1187 1188 init_timer(&conn->nopin_timer); 1189 conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ); 1190 conn->nopin_timer.data = (unsigned long)conn; 1191 conn->nopin_timer.function = iscsit_handle_nopin_timeout; 1192 conn->nopin_timer_flags &= ~ISCSI_TF_STOP; 1193 conn->nopin_timer_flags |= ISCSI_TF_RUNNING; 1194 add_timer(&conn->nopin_timer); 1195 1196 pr_debug("Started NOPIN Timer on CID: %d at %u second" 1197 " interval\n", conn->cid, na->nopin_timeout); 1198 spin_unlock_bh(&conn->nopin_timer_lock); 1199 } 1200 1201 void iscsit_stop_nopin_timer(struct iscsi_conn *conn) 1202 { 1203 spin_lock_bh(&conn->nopin_timer_lock); 1204 if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) { 1205 spin_unlock_bh(&conn->nopin_timer_lock); 1206 return; 1207 } 1208 conn->nopin_timer_flags |= ISCSI_TF_STOP; 1209 spin_unlock_bh(&conn->nopin_timer_lock); 1210 1211 del_timer_sync(&conn->nopin_timer); 1212 1213 spin_lock_bh(&conn->nopin_timer_lock); 1214 conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING; 1215 spin_unlock_bh(&conn->nopin_timer_lock); 1216 } 1217 1218 int iscsit_send_tx_data( 1219 struct iscsi_cmd *cmd, 1220 struct iscsi_conn *conn, 1221 int use_misc) 1222 { 1223 int tx_sent, tx_size; 1224 u32 iov_count; 1225 struct kvec *iov; 1226 1227 send_data: 1228 tx_size = cmd->tx_size; 1229 1230 if (!use_misc) { 1231 iov = &cmd->iov_data[0]; 1232 iov_count = cmd->iov_data_count; 1233 } else { 1234 iov = &cmd->iov_misc[0]; 1235 iov_count = cmd->iov_misc_count; 1236 } 1237 1238 tx_sent = tx_data(conn, &iov[0], iov_count, tx_size); 1239 if (tx_size != tx_sent) { 1240 if (tx_sent == -EAGAIN) { 1241 pr_err("tx_data() returned -EAGAIN\n"); 1242 goto send_data; 1243 } else 1244 return -1; 1245 } 1246 cmd->tx_size = 0; 1247 1248 return 0; 1249 } 1250 1251 int iscsit_fe_sendpage_sg( 1252 struct iscsi_cmd *cmd, 1253 struct iscsi_conn *conn) 1254 { 1255 struct scatterlist *sg = cmd->first_data_sg; 1256 struct kvec iov; 1257 u32 tx_hdr_size, data_len; 1258 u32 offset = cmd->first_data_sg_off; 1259 int tx_sent, iov_off; 1260 1261 send_hdr: 1262 tx_hdr_size = ISCSI_HDR_LEN; 1263 if (conn->conn_ops->HeaderDigest) 1264 tx_hdr_size += ISCSI_CRC_LEN; 1265 1266 iov.iov_base = cmd->pdu; 1267 iov.iov_len = tx_hdr_size; 1268 1269 tx_sent = tx_data(conn, &iov, 1, tx_hdr_size); 1270 if (tx_hdr_size != tx_sent) { 1271 if (tx_sent == -EAGAIN) { 1272 pr_err("tx_data() returned -EAGAIN\n"); 1273 goto send_hdr; 1274 } 1275 return -1; 1276 } 1277 1278 data_len = cmd->tx_size - tx_hdr_size - cmd->padding; 1279 /* 1280 * Set iov_off used by padding and data digest tx_data() calls below 1281 * in order to determine proper offset into cmd->iov_data[] 1282 */ 1283 if (conn->conn_ops->DataDigest) { 1284 data_len -= ISCSI_CRC_LEN; 1285 if (cmd->padding) 1286 iov_off = (cmd->iov_data_count - 2); 1287 else 1288 iov_off = (cmd->iov_data_count - 1); 1289 } else { 1290 iov_off = (cmd->iov_data_count - 1); 1291 } 1292 /* 1293 * Perform sendpage() for each page in the scatterlist 1294 */ 1295 while (data_len) { 1296 u32 space = (sg->length - offset); 1297 u32 sub_len = min_t(u32, data_len, space); 1298 send_pg: 1299 tx_sent = conn->sock->ops->sendpage(conn->sock, 1300 sg_page(sg), sg->offset + offset, sub_len, 0); 1301 if (tx_sent != sub_len) { 1302 if (tx_sent == -EAGAIN) { 1303 pr_err("tcp_sendpage() returned" 1304 " -EAGAIN\n"); 1305 goto send_pg; 1306 } 1307 1308 pr_err("tcp_sendpage() failure: %d\n", 1309 tx_sent); 1310 return -1; 1311 } 1312 1313 data_len -= sub_len; 1314 offset = 0; 1315 sg = sg_next(sg); 1316 } 1317 1318 send_padding: 1319 if (cmd->padding) { 1320 struct kvec *iov_p = &cmd->iov_data[iov_off++]; 1321 1322 tx_sent = tx_data(conn, iov_p, 1, cmd->padding); 1323 if (cmd->padding != tx_sent) { 1324 if (tx_sent == -EAGAIN) { 1325 pr_err("tx_data() returned -EAGAIN\n"); 1326 goto send_padding; 1327 } 1328 return -1; 1329 } 1330 } 1331 1332 send_datacrc: 1333 if (conn->conn_ops->DataDigest) { 1334 struct kvec *iov_d = &cmd->iov_data[iov_off]; 1335 1336 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN); 1337 if (ISCSI_CRC_LEN != tx_sent) { 1338 if (tx_sent == -EAGAIN) { 1339 pr_err("tx_data() returned -EAGAIN\n"); 1340 goto send_datacrc; 1341 } 1342 return -1; 1343 } 1344 } 1345 1346 return 0; 1347 } 1348 1349 /* 1350 * This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU 1351 * back to the Initiator when an expection condition occurs with the 1352 * errors set in status_class and status_detail. 1353 * 1354 * Parameters: iSCSI Connection, Status Class, Status Detail. 1355 * Returns: 0 on success, -1 on error. 1356 */ 1357 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail) 1358 { 1359 u8 iscsi_hdr[ISCSI_HDR_LEN]; 1360 int err; 1361 struct kvec iov; 1362 struct iscsi_login_rsp *hdr; 1363 1364 iscsit_collect_login_stats(conn, status_class, status_detail); 1365 1366 memset(&iov, 0, sizeof(struct kvec)); 1367 memset(&iscsi_hdr, 0x0, ISCSI_HDR_LEN); 1368 1369 hdr = (struct iscsi_login_rsp *)&iscsi_hdr; 1370 hdr->opcode = ISCSI_OP_LOGIN_RSP; 1371 hdr->status_class = status_class; 1372 hdr->status_detail = status_detail; 1373 hdr->itt = cpu_to_be32(conn->login_itt); 1374 1375 iov.iov_base = &iscsi_hdr; 1376 iov.iov_len = ISCSI_HDR_LEN; 1377 1378 PRINT_BUFF(iscsi_hdr, ISCSI_HDR_LEN); 1379 1380 err = tx_data(conn, &iov, 1, ISCSI_HDR_LEN); 1381 if (err != ISCSI_HDR_LEN) { 1382 pr_err("tx_data returned less than expected\n"); 1383 return -1; 1384 } 1385 1386 return 0; 1387 } 1388 1389 void iscsit_print_session_params(struct iscsi_session *sess) 1390 { 1391 struct iscsi_conn *conn; 1392 1393 pr_debug("-----------------------------[Session Params for" 1394 " SID: %u]-----------------------------\n", sess->sid); 1395 spin_lock_bh(&sess->conn_lock); 1396 list_for_each_entry(conn, &sess->sess_conn_list, conn_list) 1397 iscsi_dump_conn_ops(conn->conn_ops); 1398 spin_unlock_bh(&sess->conn_lock); 1399 1400 iscsi_dump_sess_ops(sess->sess_ops); 1401 } 1402 1403 static int iscsit_do_rx_data( 1404 struct iscsi_conn *conn, 1405 struct iscsi_data_count *count) 1406 { 1407 int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len; 1408 struct kvec *iov_p; 1409 struct msghdr msg; 1410 1411 if (!conn || !conn->sock || !conn->conn_ops) 1412 return -1; 1413 1414 memset(&msg, 0, sizeof(struct msghdr)); 1415 1416 iov_p = count->iov; 1417 iov_len = count->iov_count; 1418 1419 while (total_rx < data) { 1420 rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len, 1421 (data - total_rx), MSG_WAITALL); 1422 if (rx_loop <= 0) { 1423 pr_debug("rx_loop: %d total_rx: %d\n", 1424 rx_loop, total_rx); 1425 return rx_loop; 1426 } 1427 total_rx += rx_loop; 1428 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n", 1429 rx_loop, total_rx, data); 1430 } 1431 1432 return total_rx; 1433 } 1434 1435 static int iscsit_do_tx_data( 1436 struct iscsi_conn *conn, 1437 struct iscsi_data_count *count) 1438 { 1439 int data = count->data_length, total_tx = 0, tx_loop = 0, iov_len; 1440 struct kvec *iov_p; 1441 struct msghdr msg; 1442 1443 if (!conn || !conn->sock || !conn->conn_ops) 1444 return -1; 1445 1446 if (data <= 0) { 1447 pr_err("Data length is: %d\n", data); 1448 return -1; 1449 } 1450 1451 memset(&msg, 0, sizeof(struct msghdr)); 1452 1453 iov_p = count->iov; 1454 iov_len = count->iov_count; 1455 1456 while (total_tx < data) { 1457 tx_loop = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len, 1458 (data - total_tx)); 1459 if (tx_loop <= 0) { 1460 pr_debug("tx_loop: %d total_tx %d\n", 1461 tx_loop, total_tx); 1462 return tx_loop; 1463 } 1464 total_tx += tx_loop; 1465 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n", 1466 tx_loop, total_tx, data); 1467 } 1468 1469 return total_tx; 1470 } 1471 1472 int rx_data( 1473 struct iscsi_conn *conn, 1474 struct kvec *iov, 1475 int iov_count, 1476 int data) 1477 { 1478 struct iscsi_data_count c; 1479 1480 if (!conn || !conn->sock || !conn->conn_ops) 1481 return -1; 1482 1483 memset(&c, 0, sizeof(struct iscsi_data_count)); 1484 c.iov = iov; 1485 c.iov_count = iov_count; 1486 c.data_length = data; 1487 c.type = ISCSI_RX_DATA; 1488 1489 return iscsit_do_rx_data(conn, &c); 1490 } 1491 1492 int tx_data( 1493 struct iscsi_conn *conn, 1494 struct kvec *iov, 1495 int iov_count, 1496 int data) 1497 { 1498 struct iscsi_data_count c; 1499 1500 if (!conn || !conn->sock || !conn->conn_ops) 1501 return -1; 1502 1503 memset(&c, 0, sizeof(struct iscsi_data_count)); 1504 c.iov = iov; 1505 c.iov_count = iov_count; 1506 c.data_length = data; 1507 c.type = ISCSI_TX_DATA; 1508 1509 return iscsit_do_tx_data(conn, &c); 1510 } 1511 1512 void iscsit_collect_login_stats( 1513 struct iscsi_conn *conn, 1514 u8 status_class, 1515 u8 status_detail) 1516 { 1517 struct iscsi_param *intrname = NULL; 1518 struct iscsi_tiqn *tiqn; 1519 struct iscsi_login_stats *ls; 1520 1521 tiqn = iscsit_snmp_get_tiqn(conn); 1522 if (!tiqn) 1523 return; 1524 1525 ls = &tiqn->login_stats; 1526 1527 spin_lock(&ls->lock); 1528 if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) && 1529 ((get_jiffies_64() - ls->last_fail_time) < 10)) { 1530 /* We already have the failure info for this login */ 1531 spin_unlock(&ls->lock); 1532 return; 1533 } 1534 1535 if (status_class == ISCSI_STATUS_CLS_SUCCESS) 1536 ls->accepts++; 1537 else if (status_class == ISCSI_STATUS_CLS_REDIRECT) { 1538 ls->redirects++; 1539 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT; 1540 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1541 (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) { 1542 ls->authenticate_fails++; 1543 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHENTICATE; 1544 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1545 (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) { 1546 ls->authorize_fails++; 1547 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE; 1548 } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) && 1549 (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) { 1550 ls->negotiate_fails++; 1551 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE; 1552 } else { 1553 ls->other_fails++; 1554 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER; 1555 } 1556 1557 /* Save initiator name, ip address and time, if it is a failed login */ 1558 if (status_class != ISCSI_STATUS_CLS_SUCCESS) { 1559 if (conn->param_list) 1560 intrname = iscsi_find_param_from_key(INITIATORNAME, 1561 conn->param_list); 1562 strcpy(ls->last_intr_fail_name, 1563 (intrname ? intrname->value : "Unknown")); 1564 1565 ls->last_intr_fail_ip_family = conn->sock->sk->sk_family; 1566 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE, 1567 "%s", conn->login_ip); 1568 ls->last_fail_time = get_jiffies_64(); 1569 } 1570 1571 spin_unlock(&ls->lock); 1572 } 1573 1574 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn) 1575 { 1576 struct iscsi_portal_group *tpg; 1577 1578 if (!conn || !conn->sess) 1579 return NULL; 1580 1581 tpg = conn->sess->tpg; 1582 if (!tpg) 1583 return NULL; 1584 1585 if (!tpg->tpg_tiqn) 1586 return NULL; 1587 1588 return tpg->tpg_tiqn; 1589 } 1590