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_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 }