drivers/target/iscsi/iscsi_target_util.c

   1 /*******************************************************************************
   2  * This file contains the iSCSI Target specific utility functions.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/list.h>
  20 #include <linux/sched/signal.h>
  21 #include <net/ipv6.h>         /* ipv6_addr_equal() */
  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/iscsi/iscsi_transport.h>
  27
  28 #include <target/iscsi/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_util.h"
  37 #include "iscsi_target.h"
  38
  39 #define PRINT_BUFF(buff, len)                                   \
  40 {                                                               \
  41         int zzz;                                                \
  42                                                                 \
  43         pr_debug("%d:\n", __LINE__);                            \
  44         for (zzz = 0; zzz < len; zzz++) {                       \
  45                 if (zzz % 16 == 0) {                            \
  46                         if (zzz)                                \
  47                                 pr_debug("\n");                 \
  48                         pr_debug("%4i: ", zzz);                 \
  49                 }                                               \
  50                 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
  51         }                                                       \
  52         if ((len + 1) % 16)                                     \
  53                 pr_debug("\n");                                 \
  54 }
  55
  56 extern struct list_head g_tiqn_list;
  57 extern spinlock_t tiqn_lock;
  58
  59 int iscsit_add_r2t_to_list(
  60         struct iscsi_cmd *cmd,
  61         u32 offset,
  62         u32 xfer_len,
  63         int recovery,
  64         u32 r2t_sn)
  65 {
  66         struct iscsi_r2t *r2t;
  67
  68         lockdep_assert_held(&cmd->r2t_lock);
  69
  70         WARN_ON_ONCE((s32)xfer_len < 0);
  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 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
 133 {
 134         lockdep_assert_held(&cmd->r2t_lock);
 135
 136         list_del(&r2t->r2t_list);
 137         kmem_cache_free(lio_r2t_cache, r2t);
 138 }
 139
 140 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
 141 {
 142         struct iscsi_r2t *r2t, *r2t_tmp;
 143
 144         spin_lock_bh(&cmd->r2t_lock);
 145         list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
 146                 iscsit_free_r2t(r2t, cmd);
 147         spin_unlock_bh(&cmd->r2t_lock);
 148 }
 149
 150 static int iscsit_wait_for_tag(struct se_session *se_sess, int state, int *cpup)
 151 {
 152         int tag = -1;
 153         DEFINE_SBQ_WAIT(wait);
 154         struct sbq_wait_state *ws;
 155         struct sbitmap_queue *sbq;
 156
 157         if (state == TASK_RUNNING)
 158                 return tag;
 159
 160         sbq = &se_sess->sess_tag_pool;
 161         ws = &sbq->ws[0];
 162         for (;;) {
 163                 sbitmap_prepare_to_wait(sbq, ws, &wait, state);
 164                 if (signal_pending_state(state, current))
 165                         break;
 166                 tag = sbitmap_queue_get(sbq, cpup);
 167                 if (tag >= 0)
 168                         break;
 169                 schedule();
 170         }
 171
 172         sbitmap_finish_wait(sbq, ws, &wait);
 173         return tag;
 174 }
 175
 176 /*
 177  * May be called from software interrupt (timer) context for allocating
 178  * iSCSI NopINs.
 179  */
 180 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
 181 {
 182         struct iscsi_cmd *cmd;
 183         struct se_session *se_sess = conn->sess->se_sess;
 184         int size, tag, cpu;
 185
 186         tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu);
 187         if (tag < 0)
 188                 tag = iscsit_wait_for_tag(se_sess, state, &cpu);
 189         if (tag < 0)
 190                 return NULL;
 191
 192         size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
 193         cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
 194         memset(cmd, 0, size);
 195
 196         cmd->se_cmd.map_tag = tag;
 197         cmd->se_cmd.map_cpu = cpu;
 198         cmd->conn = conn;
 199         cmd->data_direction = DMA_NONE;
 200         INIT_LIST_HEAD(&cmd->i_conn_node);
 201         INIT_LIST_HEAD(&cmd->datain_list);
 202         INIT_LIST_HEAD(&cmd->cmd_r2t_list);
 203         spin_lock_init(&cmd->datain_lock);
 204         spin_lock_init(&cmd->dataout_timeout_lock);
 205         spin_lock_init(&cmd->istate_lock);
 206         spin_lock_init(&cmd->error_lock);
 207         spin_lock_init(&cmd->r2t_lock);
 208         timer_setup(&cmd->dataout_timer, iscsit_handle_dataout_timeout, 0);
 209
 210         return cmd;
 211 }
 212 EXPORT_SYMBOL(iscsit_allocate_cmd);
 213
 214 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
 215         struct iscsi_cmd *cmd,
 216         u32 seq_send_order)
 217 {
 218         u32 i;
 219
 220         for (i = 0; i < cmd->seq_count; i++)
 221                 if (cmd->seq_list[i].seq_send_order == seq_send_order)
 222                         return &cmd->seq_list[i];
 223
 224         return NULL;
 225 }
 226
 227 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
 228 {
 229         u32 i;
 230
 231         if (!cmd->seq_list) {
 232                 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
 233                 return NULL;
 234         }
 235
 236         for (i = 0; i < cmd->seq_count; i++) {
 237                 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
 238                         continue;
 239                 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
 240                         cmd->seq_send_order++;
 241                         return &cmd->seq_list[i];
 242                 }
 243         }
 244
 245         return NULL;
 246 }
 247
 248 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
 249         struct iscsi_cmd *cmd,
 250         u32 r2t_sn)
 251 {
 252         struct iscsi_r2t *r2t;
 253
 254         spin_lock_bh(&cmd->r2t_lock);
 255         list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
 256                 if (r2t->r2t_sn == r2t_sn) {
 257                         spin_unlock_bh(&cmd->r2t_lock);
 258                         return r2t;
 259                 }
 260         }
 261         spin_unlock_bh(&cmd->r2t_lock);
 262
 263         return NULL;
 264 }
 265
 266 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
 267 {
 268         u32 max_cmdsn;
 269         int ret;
 270
 271         /*
 272          * This is the proper method of checking received CmdSN against
 273          * ExpCmdSN and MaxCmdSN values, as well as accounting for out
 274          * or order CmdSNs due to multiple connection sessions and/or
 275          * CRC failures.
 276          */
 277         max_cmdsn = atomic_read(&sess->max_cmd_sn);
 278         if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
 279                 pr_err("Received CmdSN: 0x%08x is greater than"
 280                        " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
 281                 ret = CMDSN_MAXCMDSN_OVERRUN;
 282
 283         } else if (cmdsn == sess->exp_cmd_sn) {
 284                 sess->exp_cmd_sn++;
 285                 pr_debug("Received CmdSN matches ExpCmdSN,"
 286                       " incremented ExpCmdSN to: 0x%08x\n",
 287                       sess->exp_cmd_sn);
 288                 ret = CMDSN_NORMAL_OPERATION;
 289
 290         } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
 291                 pr_debug("Received CmdSN: 0x%08x is greater"
 292                       " than ExpCmdSN: 0x%08x, not acknowledging.\n",
 293                       cmdsn, sess->exp_cmd_sn);
 294                 ret = CMDSN_HIGHER_THAN_EXP;
 295
 296         } else {
 297                 pr_err("Received CmdSN: 0x%08x is less than"
 298                        " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
 299                        sess->exp_cmd_sn);
 300                 ret = CMDSN_LOWER_THAN_EXP;
 301         }
 302
 303         return ret;
 304 }
 305
 306 /*
 307  * Commands may be received out of order if MC/S is in use.
 308  * Ensure they are executed in CmdSN order.
 309  */
 310 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 311                         unsigned char *buf, __be32 cmdsn)
 312 {
 313         int ret, cmdsn_ret;
 314         bool reject = false;
 315         u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
 316
 317         mutex_lock(&conn->sess->cmdsn_mutex);
 318
 319         cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
 320         switch (cmdsn_ret) {
 321         case CMDSN_NORMAL_OPERATION:
 322                 ret = iscsit_execute_cmd(cmd, 0);
 323                 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
 324                         iscsit_execute_ooo_cmdsns(conn->sess);
 325                 else if (ret < 0) {
 326                         reject = true;
 327                         ret = CMDSN_ERROR_CANNOT_RECOVER;
 328                 }
 329                 break;
 330         case CMDSN_HIGHER_THAN_EXP:
 331                 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
 332                 if (ret < 0) {
 333                         reject = true;
 334                         ret = CMDSN_ERROR_CANNOT_RECOVER;
 335                         break;
 336                 }
 337                 ret = CMDSN_HIGHER_THAN_EXP;
 338                 break;
 339         case CMDSN_LOWER_THAN_EXP:
 340         case CMDSN_MAXCMDSN_OVERRUN:
 341         default:
 342                 cmd->i_state = ISTATE_REMOVE;
 343                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
 344                 /*
 345                  * Existing callers for iscsit_sequence_cmd() will silently
 346                  * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
 347                  * return for CMDSN_MAXCMDSN_OVERRUN as well..
 348                  */
 349                 ret = CMDSN_LOWER_THAN_EXP;
 350                 break;
 351         }
 352         mutex_unlock(&conn->sess->cmdsn_mutex);
 353
 354         if (reject)
 355                 iscsit_reject_cmd(cmd, reason, buf);
 356
 357         return ret;
 358 }
 359 EXPORT_SYMBOL(iscsit_sequence_cmd);
 360
 361 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
 362 {
 363         struct iscsi_conn *conn = cmd->conn;
 364         struct se_cmd *se_cmd = &cmd->se_cmd;
 365         struct iscsi_data *hdr = (struct iscsi_data *) buf;
 366         u32 payload_length = ntoh24(hdr->dlength);
 367
 368         if (conn->sess->sess_ops->InitialR2T) {
 369                 pr_err("Received unexpected unsolicited data"
 370                         " while InitialR2T=Yes, protocol error.\n");
 371                 transport_send_check_condition_and_sense(se_cmd,
 372                                 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
 373                 return -1;
 374         }
 375
 376         if ((cmd->first_burst_len + payload_length) >
 377              conn->sess->sess_ops->FirstBurstLength) {
 378                 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
 379                         " for this Unsolicited DataOut Burst.\n",
 380                         (cmd->first_burst_len + payload_length),
 381                                 conn->sess->sess_ops->FirstBurstLength);
 382                 transport_send_check_condition_and_sense(se_cmd,
 383                                 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
 384                 return -1;
 385         }
 386
 387         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
 388                 return 0;
 389
 390         if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
 391             ((cmd->first_burst_len + payload_length) !=
 392               conn->sess->sess_ops->FirstBurstLength)) {
 393                 pr_err("Unsolicited non-immediate data received %u"
 394                         " does not equal FirstBurstLength: %u, and does"
 395                         " not equal ExpXferLen %u.\n",
 396                         (cmd->first_burst_len + payload_length),
 397                         conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
 398                 transport_send_check_condition_and_sense(se_cmd,
 399                                 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
 400                 return -1;
 401         }
 402         return 0;
 403 }
 404
 405 struct iscsi_cmd *iscsit_find_cmd_from_itt(
 406         struct iscsi_conn *conn,
 407         itt_t init_task_tag)
 408 {
 409         struct iscsi_cmd *cmd;
 410
 411         spin_lock_bh(&conn->cmd_lock);
 412         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 413                 if (cmd->init_task_tag == init_task_tag) {
 414                         spin_unlock_bh(&conn->cmd_lock);
 415                         return cmd;
 416                 }
 417         }
 418         spin_unlock_bh(&conn->cmd_lock);
 419
 420         pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
 421                         init_task_tag, conn->cid);
 422         return NULL;
 423 }
 424 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
 425
 426 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
 427         struct iscsi_conn *conn,
 428         itt_t init_task_tag,
 429         u32 length)
 430 {
 431         struct iscsi_cmd *cmd;
 432
 433         spin_lock_bh(&conn->cmd_lock);
 434         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 435                 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
 436                         continue;
 437                 if (cmd->init_task_tag == init_task_tag) {
 438                         spin_unlock_bh(&conn->cmd_lock);
 439                         return cmd;
 440                 }
 441         }
 442         spin_unlock_bh(&conn->cmd_lock);
 443
 444         pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
 445                         " dumping payload\n", init_task_tag, conn->cid);
 446         if (length)
 447                 iscsit_dump_data_payload(conn, length, 1);
 448
 449         return NULL;
 450 }
 451 EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
 452
 453 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
 454         struct iscsi_conn *conn,
 455         u32 targ_xfer_tag)
 456 {
 457         struct iscsi_cmd *cmd = NULL;
 458
 459         spin_lock_bh(&conn->cmd_lock);
 460         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 461                 if (cmd->targ_xfer_tag == targ_xfer_tag) {
 462                         spin_unlock_bh(&conn->cmd_lock);
 463                         return cmd;
 464                 }
 465         }
 466         spin_unlock_bh(&conn->cmd_lock);
 467
 468         pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
 469                         targ_xfer_tag, conn->cid);
 470         return NULL;
 471 }
 472
 473 int iscsit_find_cmd_for_recovery(
 474         struct iscsi_session *sess,
 475         struct iscsi_cmd **cmd_ptr,
 476         struct iscsi_conn_recovery **cr_ptr,
 477         itt_t init_task_tag)
 478 {
 479         struct iscsi_cmd *cmd = NULL;
 480         struct iscsi_conn_recovery *cr;
 481         /*
 482          * Scan through the inactive connection recovery list's command list.
 483          * If init_task_tag matches the command is still alligent.
 484          */
 485         spin_lock(&sess->cr_i_lock);
 486         list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
 487                 spin_lock(&cr->conn_recovery_cmd_lock);
 488                 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
 489                         if (cmd->init_task_tag == init_task_tag) {
 490                                 spin_unlock(&cr->conn_recovery_cmd_lock);
 491                                 spin_unlock(&sess->cr_i_lock);
 492
 493                                 *cr_ptr = cr;
 494                                 *cmd_ptr = cmd;
 495                                 return -2;
 496                         }
 497                 }
 498                 spin_unlock(&cr->conn_recovery_cmd_lock);
 499         }
 500         spin_unlock(&sess->cr_i_lock);
 501         /*
 502          * Scan through the active connection recovery list's command list.
 503          * If init_task_tag matches the command is ready to be reassigned.
 504          */
 505         spin_lock(&sess->cr_a_lock);
 506         list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
 507                 spin_lock(&cr->conn_recovery_cmd_lock);
 508                 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
 509                         if (cmd->init_task_tag == init_task_tag) {
 510                                 spin_unlock(&cr->conn_recovery_cmd_lock);
 511                                 spin_unlock(&sess->cr_a_lock);
 512
 513                                 *cr_ptr = cr;
 514                                 *cmd_ptr = cmd;
 515                                 return 0;
 516                         }
 517                 }
 518                 spin_unlock(&cr->conn_recovery_cmd_lock);
 519         }
 520         spin_unlock(&sess->cr_a_lock);
 521
 522         return -1;
 523 }
 524
 525 void iscsit_add_cmd_to_immediate_queue(
 526         struct iscsi_cmd *cmd,
 527         struct iscsi_conn *conn,
 528         u8 state)
 529 {
 530         struct iscsi_queue_req *qr;
 531
 532         qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
 533         if (!qr) {
 534                 pr_err("Unable to allocate memory for"
 535                                 " struct iscsi_queue_req\n");
 536                 return;
 537         }
 538         INIT_LIST_HEAD(&qr->qr_list);
 539         qr->cmd = cmd;
 540         qr->state = state;
 541
 542         spin_lock_bh(&conn->immed_queue_lock);
 543         list_add_tail(&qr->qr_list, &conn->immed_queue_list);
 544         atomic_inc(&cmd->immed_queue_count);
 545         atomic_set(&conn->check_immediate_queue, 1);
 546         spin_unlock_bh(&conn->immed_queue_lock);
 547
 548         wake_up(&conn->queues_wq);
 549 }
 550 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
 551
 552 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
 553 {
 554         struct iscsi_queue_req *qr;
 555
 556         spin_lock_bh(&conn->immed_queue_lock);
 557         if (list_empty(&conn->immed_queue_list)) {
 558                 spin_unlock_bh(&conn->immed_queue_lock);
 559                 return NULL;
 560         }
 561         qr = list_first_entry(&conn->immed_queue_list,
 562                               struct iscsi_queue_req, qr_list);
 563
 564         list_del(&qr->qr_list);
 565         if (qr->cmd)
 566                 atomic_dec(&qr->cmd->immed_queue_count);
 567         spin_unlock_bh(&conn->immed_queue_lock);
 568
 569         return qr;
 570 }
 571
 572 static void iscsit_remove_cmd_from_immediate_queue(
 573         struct iscsi_cmd *cmd,
 574         struct iscsi_conn *conn)
 575 {
 576         struct iscsi_queue_req *qr, *qr_tmp;
 577
 578         spin_lock_bh(&conn->immed_queue_lock);
 579         if (!atomic_read(&cmd->immed_queue_count)) {
 580                 spin_unlock_bh(&conn->immed_queue_lock);
 581                 return;
 582         }
 583
 584         list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
 585                 if (qr->cmd != cmd)
 586                         continue;
 587
 588                 atomic_dec(&qr->cmd->immed_queue_count);
 589                 list_del(&qr->qr_list);
 590                 kmem_cache_free(lio_qr_cache, qr);
 591         }
 592         spin_unlock_bh(&conn->immed_queue_lock);
 593
 594         if (atomic_read(&cmd->immed_queue_count)) {
 595                 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
 596                         cmd->init_task_tag,
 597                         atomic_read(&cmd->immed_queue_count));
 598         }
 599 }
 600
 601 int iscsit_add_cmd_to_response_queue(
 602         struct iscsi_cmd *cmd,
 603         struct iscsi_conn *conn,
 604         u8 state)
 605 {
 606         struct iscsi_queue_req *qr;
 607
 608         qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
 609         if (!qr) {
 610                 pr_err("Unable to allocate memory for"
 611                         " struct iscsi_queue_req\n");
 612                 return -ENOMEM;
 613         }
 614         INIT_LIST_HEAD(&qr->qr_list);
 615         qr->cmd = cmd;
 616         qr->state = state;
 617
 618         spin_lock_bh(&conn->response_queue_lock);
 619         list_add_tail(&qr->qr_list, &conn->response_queue_list);
 620         atomic_inc(&cmd->response_queue_count);
 621         spin_unlock_bh(&conn->response_queue_lock);
 622
 623         wake_up(&conn->queues_wq);
 624         return 0;
 625 }
 626
 627 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
 628 {
 629         struct iscsi_queue_req *qr;
 630
 631         spin_lock_bh(&conn->response_queue_lock);
 632         if (list_empty(&conn->response_queue_list)) {
 633                 spin_unlock_bh(&conn->response_queue_lock);
 634                 return NULL;
 635         }
 636
 637         qr = list_first_entry(&conn->response_queue_list,
 638                               struct iscsi_queue_req, qr_list);
 639
 640         list_del(&qr->qr_list);
 641         if (qr->cmd)
 642                 atomic_dec(&qr->cmd->response_queue_count);
 643         spin_unlock_bh(&conn->response_queue_lock);
 644
 645         return qr;
 646 }
 647
 648 static void iscsit_remove_cmd_from_response_queue(
 649         struct iscsi_cmd *cmd,
 650         struct iscsi_conn *conn)
 651 {
 652         struct iscsi_queue_req *qr, *qr_tmp;
 653
 654         spin_lock_bh(&conn->response_queue_lock);
 655         if (!atomic_read(&cmd->response_queue_count)) {
 656                 spin_unlock_bh(&conn->response_queue_lock);
 657                 return;
 658         }
 659
 660         list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
 661                                 qr_list) {
 662                 if (qr->cmd != cmd)
 663                         continue;
 664
 665                 atomic_dec(&qr->cmd->response_queue_count);
 666                 list_del(&qr->qr_list);
 667                 kmem_cache_free(lio_qr_cache, qr);
 668         }
 669         spin_unlock_bh(&conn->response_queue_lock);
 670
 671         if (atomic_read(&cmd->response_queue_count)) {
 672                 pr_err("ITT: 0x%08x response_queue_count: %d\n",
 673                         cmd->init_task_tag,
 674                         atomic_read(&cmd->response_queue_count));
 675         }
 676 }
 677
 678 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
 679 {
 680         bool empty;
 681
 682         spin_lock_bh(&conn->immed_queue_lock);
 683         empty = list_empty(&conn->immed_queue_list);
 684         spin_unlock_bh(&conn->immed_queue_lock);
 685
 686         if (!empty)
 687                 return empty;
 688
 689         spin_lock_bh(&conn->response_queue_lock);
 690         empty = list_empty(&conn->response_queue_list);
 691         spin_unlock_bh(&conn->response_queue_lock);
 692
 693         return empty;
 694 }
 695
 696 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
 697 {
 698         struct iscsi_queue_req *qr, *qr_tmp;
 699
 700         spin_lock_bh(&conn->immed_queue_lock);
 701         list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
 702                 list_del(&qr->qr_list);
 703                 if (qr->cmd)
 704                         atomic_dec(&qr->cmd->immed_queue_count);
 705
 706                 kmem_cache_free(lio_qr_cache, qr);
 707         }
 708         spin_unlock_bh(&conn->immed_queue_lock);
 709
 710         spin_lock_bh(&conn->response_queue_lock);
 711         list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
 712                         qr_list) {
 713                 list_del(&qr->qr_list);
 714                 if (qr->cmd)
 715                         atomic_dec(&qr->cmd->response_queue_count);
 716
 717                 kmem_cache_free(lio_qr_cache, qr);
 718         }
 719         spin_unlock_bh(&conn->response_queue_lock);
 720 }
 721
 722 void iscsit_release_cmd(struct iscsi_cmd *cmd)
 723 {
 724         struct iscsi_session *sess;
 725         struct se_cmd *se_cmd = &cmd->se_cmd;
 726
 727         WARN_ON(!list_empty(&cmd->i_conn_node));
 728
 729         if (cmd->conn)
 730                 sess = cmd->conn->sess;
 731         else
 732                 sess = cmd->sess;
 733
 734         BUG_ON(!sess || !sess->se_sess);
 735
 736         kfree(cmd->buf_ptr);
 737         kfree(cmd->pdu_list);
 738         kfree(cmd->seq_list);
 739         kfree(cmd->tmr_req);
 740         kfree(cmd->overflow_buf);
 741         kfree(cmd->iov_data);
 742         kfree(cmd->text_in_ptr);
 743
 744         target_free_tag(sess->se_sess, se_cmd);
 745 }
 746 EXPORT_SYMBOL(iscsit_release_cmd);
 747
 748 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues)
 749 {
 750         struct iscsi_conn *conn = cmd->conn;
 751
 752         WARN_ON(!list_empty(&cmd->i_conn_node));
 753
 754         if (cmd->data_direction == DMA_TO_DEVICE) {
 755                 iscsit_stop_dataout_timer(cmd);
 756                 iscsit_free_r2ts_from_list(cmd);
 757         }
 758         if (cmd->data_direction == DMA_FROM_DEVICE)
 759                 iscsit_free_all_datain_reqs(cmd);
 760
 761         if (conn && check_queues) {
 762                 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
 763                 iscsit_remove_cmd_from_response_queue(cmd, conn);
 764         }
 765
 766         if (conn && conn->conn_transport->iscsit_unmap_cmd)
 767                 conn->conn_transport->iscsit_unmap_cmd(conn, cmd);
 768 }
 769
 770 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
 771 {
 772         struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
 773         int rc;
 774
 775         WARN_ON(!list_empty(&cmd->i_conn_node));
 776
 777         __iscsit_free_cmd(cmd, shutdown);
 778         if (se_cmd) {
 779                 rc = transport_generic_free_cmd(se_cmd, shutdown);
 780                 if (!rc && shutdown && se_cmd->se_sess) {
 781                         __iscsit_free_cmd(cmd, shutdown);
 782                         target_put_sess_cmd(se_cmd);
 783                 }
 784         } else {
 785                 iscsit_release_cmd(cmd);
 786         }
 787 }
 788 EXPORT_SYMBOL(iscsit_free_cmd);
 789
 790 int iscsit_check_session_usage_count(struct iscsi_session *sess)
 791 {
 792         spin_lock_bh(&sess->session_usage_lock);
 793         if (sess->session_usage_count != 0) {
 794                 sess->session_waiting_on_uc = 1;
 795                 spin_unlock_bh(&sess->session_usage_lock);
 796                 if (in_interrupt())
 797                         return 2;
 798
 799                 wait_for_completion(&sess->session_waiting_on_uc_comp);
 800                 return 1;
 801         }
 802         spin_unlock_bh(&sess->session_usage_lock);
 803
 804         return 0;
 805 }
 806
 807 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
 808 {
 809         spin_lock_bh(&sess->session_usage_lock);
 810         sess->session_usage_count--;
 811
 812         if (!sess->session_usage_count && sess->session_waiting_on_uc)
 813                 complete(&sess->session_waiting_on_uc_comp);
 814
 815         spin_unlock_bh(&sess->session_usage_lock);
 816 }
 817
 818 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
 819 {
 820         spin_lock_bh(&sess->session_usage_lock);
 821         sess->session_usage_count++;
 822         spin_unlock_bh(&sess->session_usage_lock);
 823 }
 824
 825 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
 826 {
 827         struct iscsi_conn *conn;
 828
 829         spin_lock_bh(&sess->conn_lock);
 830         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
 831                 if ((conn->cid == cid) &&
 832                     (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
 833                         iscsit_inc_conn_usage_count(conn);
 834                         spin_unlock_bh(&sess->conn_lock);
 835                         return conn;
 836                 }
 837         }
 838         spin_unlock_bh(&sess->conn_lock);
 839
 840         return NULL;
 841 }
 842
 843 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
 844 {
 845         struct iscsi_conn *conn;
 846
 847         spin_lock_bh(&sess->conn_lock);
 848         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
 849                 if (conn->cid == cid) {
 850                         iscsit_inc_conn_usage_count(conn);
 851                         spin_lock(&conn->state_lock);
 852                         atomic_set(&conn->connection_wait_rcfr, 1);
 853                         spin_unlock(&conn->state_lock);
 854                         spin_unlock_bh(&sess->conn_lock);
 855                         return conn;
 856                 }
 857         }
 858         spin_unlock_bh(&sess->conn_lock);
 859
 860         return NULL;
 861 }
 862
 863 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
 864 {
 865         spin_lock_bh(&conn->conn_usage_lock);
 866         if (conn->conn_usage_count != 0) {
 867                 conn->conn_waiting_on_uc = 1;
 868                 spin_unlock_bh(&conn->conn_usage_lock);
 869
 870                 wait_for_completion(&conn->conn_waiting_on_uc_comp);
 871                 return;
 872         }
 873         spin_unlock_bh(&conn->conn_usage_lock);
 874 }
 875
 876 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
 877 {
 878         spin_lock_bh(&conn->conn_usage_lock);
 879         conn->conn_usage_count--;
 880
 881         if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
 882                 complete(&conn->conn_waiting_on_uc_comp);
 883
 884         spin_unlock_bh(&conn->conn_usage_lock);
 885 }
 886
 887 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
 888 {
 889         spin_lock_bh(&conn->conn_usage_lock);
 890         conn->conn_usage_count++;
 891         spin_unlock_bh(&conn->conn_usage_lock);
 892 }
 893
 894 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
 895 {
 896         u8 state;
 897         struct iscsi_cmd *cmd;
 898
 899         cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
 900         if (!cmd)
 901                 return -1;
 902
 903         cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
 904         state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
 905                                 ISTATE_SEND_NOPIN_NO_RESPONSE;
 906         cmd->init_task_tag = RESERVED_ITT;
 907         cmd->targ_xfer_tag = (want_response) ?
 908                              session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
 909         spin_lock_bh(&conn->cmd_lock);
 910         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 911         spin_unlock_bh(&conn->cmd_lock);
 912
 913         if (want_response)
 914                 iscsit_start_nopin_response_timer(conn);
 915         iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
 916
 917         return 0;
 918 }
 919
 920 void iscsit_handle_nopin_response_timeout(struct timer_list *t)
 921 {
 922         struct iscsi_conn *conn = from_timer(conn, t, nopin_response_timer);
 923         struct iscsi_session *sess = conn->sess;
 924
 925         iscsit_inc_conn_usage_count(conn);
 926
 927         spin_lock_bh(&conn->nopin_timer_lock);
 928         if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
 929                 spin_unlock_bh(&conn->nopin_timer_lock);
 930                 iscsit_dec_conn_usage_count(conn);
 931                 return;
 932         }
 933
 934         pr_err("Did not receive response to NOPIN on CID: %hu, failing"
 935                 " connection for I_T Nexus %s,i,0x%6phN,%s,t,0x%02x\n",
 936                 conn->cid, sess->sess_ops->InitiatorName, sess->isid,
 937                 sess->tpg->tpg_tiqn->tiqn, (u32)sess->tpg->tpgt);
 938         conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
 939         spin_unlock_bh(&conn->nopin_timer_lock);
 940
 941         iscsit_fill_cxn_timeout_err_stats(sess);
 942         iscsit_cause_connection_reinstatement(conn, 0);
 943         iscsit_dec_conn_usage_count(conn);
 944 }
 945
 946 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
 947 {
 948         struct iscsi_session *sess = conn->sess;
 949         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
 950
 951         spin_lock_bh(&conn->nopin_timer_lock);
 952         if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
 953                 spin_unlock_bh(&conn->nopin_timer_lock);
 954                 return;
 955         }
 956
 957         mod_timer(&conn->nopin_response_timer,
 958                 (get_jiffies_64() + na->nopin_response_timeout * HZ));
 959         spin_unlock_bh(&conn->nopin_timer_lock);
 960 }
 961
 962 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
 963 {
 964         struct iscsi_session *sess = conn->sess;
 965         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
 966
 967         spin_lock_bh(&conn->nopin_timer_lock);
 968         if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
 969                 spin_unlock_bh(&conn->nopin_timer_lock);
 970                 return;
 971         }
 972
 973         conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
 974         conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
 975         mod_timer(&conn->nopin_response_timer,
 976                   jiffies + na->nopin_response_timeout * HZ);
 977
 978         pr_debug("Started NOPIN Response Timer on CID: %d to %u"
 979                 " seconds\n", conn->cid, na->nopin_response_timeout);
 980         spin_unlock_bh(&conn->nopin_timer_lock);
 981 }
 982
 983 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
 984 {
 985         spin_lock_bh(&conn->nopin_timer_lock);
 986         if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
 987                 spin_unlock_bh(&conn->nopin_timer_lock);
 988                 return;
 989         }
 990         conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
 991         spin_unlock_bh(&conn->nopin_timer_lock);
 992
 993         del_timer_sync(&conn->nopin_response_timer);
 994
 995         spin_lock_bh(&conn->nopin_timer_lock);
 996         conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
 997         spin_unlock_bh(&conn->nopin_timer_lock);
 998 }
 999
1000 void iscsit_handle_nopin_timeout(struct timer_list *t)
1001 {
1002         struct iscsi_conn *conn = from_timer(conn, t, nopin_timer);
1003
1004         iscsit_inc_conn_usage_count(conn);
1005
1006         spin_lock_bh(&conn->nopin_timer_lock);
1007         if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1008                 spin_unlock_bh(&conn->nopin_timer_lock);
1009                 iscsit_dec_conn_usage_count(conn);
1010                 return;
1011         }
1012         conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1013         spin_unlock_bh(&conn->nopin_timer_lock);
1014
1015         iscsit_add_nopin(conn, 1);
1016         iscsit_dec_conn_usage_count(conn);
1017 }
1018
1019 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1020 {
1021         struct iscsi_session *sess = conn->sess;
1022         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1023
1024         lockdep_assert_held(&conn->nopin_timer_lock);
1025
1026         /*
1027         * NOPIN timeout is disabled.
1028          */
1029         if (!na->nopin_timeout)
1030                 return;
1031
1032         if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1033                 return;
1034
1035         conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1036         conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1037         mod_timer(&conn->nopin_timer, jiffies + na->nopin_timeout * HZ);
1038
1039         pr_debug("Started NOPIN Timer on CID: %d at %u second"
1040                 " interval\n", conn->cid, na->nopin_timeout);
1041 }
1042
1043 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1044 {
1045         spin_lock_bh(&conn->nopin_timer_lock);
1046         __iscsit_start_nopin_timer(conn);
1047         spin_unlock_bh(&conn->nopin_timer_lock);
1048 }
1049
1050 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1051 {
1052         spin_lock_bh(&conn->nopin_timer_lock);
1053         if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1054                 spin_unlock_bh(&conn->nopin_timer_lock);
1055                 return;
1056         }
1057         conn->nopin_timer_flags |= ISCSI_TF_STOP;
1058         spin_unlock_bh(&conn->nopin_timer_lock);
1059
1060         del_timer_sync(&conn->nopin_timer);
1061
1062         spin_lock_bh(&conn->nopin_timer_lock);
1063         conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1064         spin_unlock_bh(&conn->nopin_timer_lock);
1065 }
1066
1067 int iscsit_send_tx_data(
1068         struct iscsi_cmd *cmd,
1069         struct iscsi_conn *conn,
1070         int use_misc)
1071 {
1072         int tx_sent, tx_size;
1073         u32 iov_count;
1074         struct kvec *iov;
1075
1076 send_data:
1077         tx_size = cmd->tx_size;
1078
1079         if (!use_misc) {
1080                 iov = &cmd->iov_data[0];
1081                 iov_count = cmd->iov_data_count;
1082         } else {
1083                 iov = &cmd->iov_misc[0];
1084                 iov_count = cmd->iov_misc_count;
1085         }
1086
1087         tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1088         if (tx_size != tx_sent) {
1089                 if (tx_sent == -EAGAIN) {
1090                         pr_err("tx_data() returned -EAGAIN\n");
1091                         goto send_data;
1092                 } else
1093                         return -1;
1094         }
1095         cmd->tx_size = 0;
1096
1097         return 0;
1098 }
1099
1100 int iscsit_fe_sendpage_sg(
1101         struct iscsi_cmd *cmd,
1102         struct iscsi_conn *conn)
1103 {
1104         struct scatterlist *sg = cmd->first_data_sg;
1105         struct kvec iov;
1106         u32 tx_hdr_size, data_len;
1107         u32 offset = cmd->first_data_sg_off;
1108         int tx_sent, iov_off;
1109
1110 send_hdr:
1111         tx_hdr_size = ISCSI_HDR_LEN;
1112         if (conn->conn_ops->HeaderDigest)
1113                 tx_hdr_size += ISCSI_CRC_LEN;
1114
1115         iov.iov_base = cmd->pdu;
1116         iov.iov_len = tx_hdr_size;
1117
1118         tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1119         if (tx_hdr_size != tx_sent) {
1120                 if (tx_sent == -EAGAIN) {
1121                         pr_err("tx_data() returned -EAGAIN\n");
1122                         goto send_hdr;
1123                 }
1124                 return -1;
1125         }
1126
1127         data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1128         /*
1129          * Set iov_off used by padding and data digest tx_data() calls below
1130          * in order to determine proper offset into cmd->iov_data[]
1131          */
1132         if (conn->conn_ops->DataDigest) {
1133                 data_len -= ISCSI_CRC_LEN;
1134                 if (cmd->padding)
1135                         iov_off = (cmd->iov_data_count - 2);
1136                 else
1137                         iov_off = (cmd->iov_data_count - 1);
1138         } else {
1139                 iov_off = (cmd->iov_data_count - 1);
1140         }
1141         /*
1142          * Perform sendpage() for each page in the scatterlist
1143          */
1144         while (data_len) {
1145                 u32 space = (sg->length - offset);
1146                 u32 sub_len = min_t(u32, data_len, space);
1147 send_pg:
1148                 tx_sent = conn->sock->ops->sendpage(conn->sock,
1149                                         sg_page(sg), sg->offset + offset, sub_len, 0);
1150                 if (tx_sent != sub_len) {
1151                         if (tx_sent == -EAGAIN) {
1152                                 pr_err("tcp_sendpage() returned"
1153                                                 " -EAGAIN\n");
1154                                 goto send_pg;
1155                         }
1156
1157                         pr_err("tcp_sendpage() failure: %d\n",
1158                                         tx_sent);
1159                         return -1;
1160                 }
1161
1162                 data_len -= sub_len;
1163                 offset = 0;
1164                 sg = sg_next(sg);
1165         }
1166
1167 send_padding:
1168         if (cmd->padding) {
1169                 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1170
1171                 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1172                 if (cmd->padding != tx_sent) {
1173                         if (tx_sent == -EAGAIN) {
1174                                 pr_err("tx_data() returned -EAGAIN\n");
1175                                 goto send_padding;
1176                         }
1177                         return -1;
1178                 }
1179         }
1180
1181 send_datacrc:
1182         if (conn->conn_ops->DataDigest) {
1183                 struct kvec *iov_d = &cmd->iov_data[iov_off];
1184
1185                 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1186                 if (ISCSI_CRC_LEN != tx_sent) {
1187                         if (tx_sent == -EAGAIN) {
1188                                 pr_err("tx_data() returned -EAGAIN\n");
1189                                 goto send_datacrc;
1190                         }
1191                         return -1;
1192                 }
1193         }
1194
1195         return 0;
1196 }
1197
1198 /*
1199  *      This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1200  *      back to the Initiator when an expection condition occurs with the
1201  *      errors set in status_class and status_detail.
1202  *
1203  *      Parameters:     iSCSI Connection, Status Class, Status Detail.
1204  *      Returns:        0 on success, -1 on error.
1205  */
1206 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1207 {
1208         struct iscsi_login_rsp *hdr;
1209         struct iscsi_login *login = conn->conn_login;
1210
1211         login->login_failed = 1;
1212         iscsit_collect_login_stats(conn, status_class, status_detail);
1213
1214         memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1215
1216         hdr     = (struct iscsi_login_rsp *)&login->rsp[0];
1217         hdr->opcode             = ISCSI_OP_LOGIN_RSP;
1218         hdr->status_class       = status_class;
1219         hdr->status_detail      = status_detail;
1220         hdr->itt                = conn->login_itt;
1221
1222         return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1223 }
1224
1225 void iscsit_print_session_params(struct iscsi_session *sess)
1226 {
1227         struct iscsi_conn *conn;
1228
1229         pr_debug("-----------------------------[Session Params for"
1230                 " SID: %u]-----------------------------\n", sess->sid);
1231         spin_lock_bh(&sess->conn_lock);
1232         list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1233                 iscsi_dump_conn_ops(conn->conn_ops);
1234         spin_unlock_bh(&sess->conn_lock);
1235
1236         iscsi_dump_sess_ops(sess->sess_ops);
1237 }
1238
1239 static int iscsit_do_rx_data(
1240         struct iscsi_conn *conn,
1241         struct iscsi_data_count *count)
1242 {
1243         int data = count->data_length, rx_loop = 0, total_rx = 0;
1244         struct msghdr msg;
1245
1246         if (!conn || !conn->sock || !conn->conn_ops)
1247                 return -1;
1248
1249         memset(&msg, 0, sizeof(struct msghdr));
1250         iov_iter_kvec(&msg.msg_iter, READ, count->iov, count->iov_count, data);
1251
1252         while (msg_data_left(&msg)) {
1253                 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1254                 if (rx_loop <= 0) {
1255                         pr_debug("rx_loop: %d total_rx: %d\n",
1256                                 rx_loop, total_rx);
1257                         return rx_loop;
1258                 }
1259                 total_rx += rx_loop;
1260                 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1261                                 rx_loop, total_rx, data);
1262         }
1263
1264         return total_rx;
1265 }
1266
1267 int rx_data(
1268         struct iscsi_conn *conn,
1269         struct kvec *iov,
1270         int iov_count,
1271         int data)
1272 {
1273         struct iscsi_data_count c;
1274
1275         if (!conn || !conn->sock || !conn->conn_ops)
1276                 return -1;
1277
1278         memset(&c, 0, sizeof(struct iscsi_data_count));
1279         c.iov = iov;
1280         c.iov_count = iov_count;
1281         c.data_length = data;
1282         c.type = ISCSI_RX_DATA;
1283
1284         return iscsit_do_rx_data(conn, &c);
1285 }
1286
1287 int tx_data(
1288         struct iscsi_conn *conn,
1289         struct kvec *iov,
1290         int iov_count,
1291         int data)
1292 {
1293         struct msghdr msg;
1294         int total_tx = 0;
1295
1296         if (!conn || !conn->sock || !conn->conn_ops)
1297                 return -1;
1298
1299         if (data <= 0) {
1300                 pr_err("Data length is: %d\n", data);
1301                 return -1;
1302         }
1303
1304         memset(&msg, 0, sizeof(struct msghdr));
1305
1306         iov_iter_kvec(&msg.msg_iter, WRITE, iov, iov_count, data);
1307
1308         while (msg_data_left(&msg)) {
1309                 int tx_loop = sock_sendmsg(conn->sock, &msg);
1310                 if (tx_loop <= 0) {
1311                         pr_debug("tx_loop: %d total_tx %d\n",
1312                                 tx_loop, total_tx);
1313                         return tx_loop;
1314                 }
1315                 total_tx += tx_loop;
1316                 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1317                                         tx_loop, total_tx, data);
1318         }
1319
1320         return total_tx;
1321 }
1322
1323 void iscsit_collect_login_stats(
1324         struct iscsi_conn *conn,
1325         u8 status_class,
1326         u8 status_detail)
1327 {
1328         struct iscsi_param *intrname = NULL;
1329         struct iscsi_tiqn *tiqn;
1330         struct iscsi_login_stats *ls;
1331
1332         tiqn = iscsit_snmp_get_tiqn(conn);
1333         if (!tiqn)
1334                 return;
1335
1336         ls = &tiqn->login_stats;
1337
1338         spin_lock(&ls->lock);
1339         if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1340                 ls->accepts++;
1341         else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1342                 ls->redirects++;
1343                 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1344         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR)  &&
1345                  (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1346                 ls->authenticate_fails++;
1347                 ls->last_fail_type =  ISCSI_LOGIN_FAIL_AUTHENTICATE;
1348         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR)  &&
1349                  (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1350                 ls->authorize_fails++;
1351                 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1352         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1353                  (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1354                 ls->negotiate_fails++;
1355                 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1356         } else {
1357                 ls->other_fails++;
1358                 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1359         }
1360
1361         /* Save initiator name, ip address and time, if it is a failed login */
1362         if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1363                 if (conn->param_list)
1364                         intrname = iscsi_find_param_from_key(INITIATORNAME,
1365                                                              conn->param_list);
1366                 strlcpy(ls->last_intr_fail_name,
1367                        (intrname ? intrname->value : "Unknown"),
1368                        sizeof(ls->last_intr_fail_name));
1369
1370                 ls->last_intr_fail_ip_family = conn->login_family;
1371
1372                 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1373                 ls->last_fail_time = get_jiffies_64();
1374         }
1375
1376         spin_unlock(&ls->lock);
1377 }
1378
1379 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1380 {
1381         struct iscsi_portal_group *tpg;
1382
1383         if (!conn)
1384                 return NULL;
1385
1386         tpg = conn->tpg;
1387         if (!tpg)
1388                 return NULL;
1389
1390         if (!tpg->tpg_tiqn)
1391                 return NULL;
1392
1393         return tpg->tpg_tiqn;
1394 }
1395
1396 void iscsit_fill_cxn_timeout_err_stats(struct iscsi_session *sess)
1397 {
1398         struct iscsi_portal_group *tpg = sess->tpg;
1399         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
1400
1401         if (!tiqn)
1402                 return;
1403
1404         spin_lock_bh(&tiqn->sess_err_stats.lock);
1405         strlcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
1406                         sess->sess_ops->InitiatorName,
1407                         sizeof(tiqn->sess_err_stats.last_sess_fail_rem_name));
1408         tiqn->sess_err_stats.last_sess_failure_type =
1409                         ISCSI_SESS_ERR_CXN_TIMEOUT;
1410         tiqn->sess_err_stats.cxn_timeout_errors++;
1411         atomic_long_inc(&sess->conn_timeout_errors);
1412         spin_unlock_bh(&tiqn->sess_err_stats.lock);
1413 }