drivers/target/iscsi/iscsi_target_util.c

   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                                 (void *)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                                 (void *)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 }