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