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/percpu_ida.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 /*
  60  *      Called with cmd->r2t_lock held.
  61  */
  62 int iscsit_add_r2t_to_list(
  63         struct iscsi_cmd *cmd,
  64         u32 offset,
  65         u32 xfer_len,
  66         int recovery,
  67         u32 r2t_sn)
  68 {
  69         struct iscsi_r2t *r2t;
  70
  71         r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
  72         if (!r2t) {
  73                 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
  74                 return -1;
  75         }
  76         INIT_LIST_HEAD(&r2t->r2t_list);
  77
  78         r2t->recovery_r2t = recovery;
  79         r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
  80         r2t->offset = offset;
  81         r2t->xfer_len = xfer_len;
  82         list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
  83         spin_unlock_bh(&cmd->r2t_lock);
  84
  85         iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
  86
  87         spin_lock_bh(&cmd->r2t_lock);
  88         return 0;
  89 }
  90
  91 struct iscsi_r2t *iscsit_get_r2t_for_eos(
  92         struct iscsi_cmd *cmd,
  93         u32 offset,
  94         u32 length)
  95 {
  96         struct iscsi_r2t *r2t;
  97
  98         spin_lock_bh(&cmd->r2t_lock);
  99         list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
 100                 if ((r2t->offset <= offset) &&
 101                     (r2t->offset + r2t->xfer_len) >= (offset + length)) {
 102                         spin_unlock_bh(&cmd->r2t_lock);
 103                         return r2t;
 104                 }
 105         }
 106         spin_unlock_bh(&cmd->r2t_lock);
 107
 108         pr_err("Unable to locate R2T for Offset: %u, Length:"
 109                         " %u\n", offset, length);
 110         return NULL;
 111 }
 112
 113 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
 114 {
 115         struct iscsi_r2t *r2t;
 116
 117         spin_lock_bh(&cmd->r2t_lock);
 118         list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
 119                 if (!r2t->sent_r2t) {
 120                         spin_unlock_bh(&cmd->r2t_lock);
 121                         return r2t;
 122                 }
 123         }
 124         spin_unlock_bh(&cmd->r2t_lock);
 125
 126         pr_err("Unable to locate next R2T to send for ITT:"
 127                         " 0x%08x.\n", cmd->init_task_tag);
 128         return NULL;
 129 }
 130
 131 /*
 132  *      Called with cmd->r2t_lock held.
 133  */
 134 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
 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 /*
 151  * May be called from software interrupt (timer) context for allocating
 152  * iSCSI NopINs.
 153  */
 154 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
 155 {
 156         struct iscsi_cmd *cmd;
 157         struct se_session *se_sess = conn->sess->se_sess;
 158         int size, tag;
 159
 160         tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
 161         if (tag < 0)
 162                 return NULL;
 163
 164         size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
 165         cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
 166         memset(cmd, 0, size);
 167
 168         cmd->se_cmd.map_tag = tag;
 169         cmd->conn = conn;
 170         cmd->data_direction = DMA_NONE;
 171         INIT_LIST_HEAD(&cmd->i_conn_node);
 172         INIT_LIST_HEAD(&cmd->datain_list);
 173         INIT_LIST_HEAD(&cmd->cmd_r2t_list);
 174         spin_lock_init(&cmd->datain_lock);
 175         spin_lock_init(&cmd->dataout_timeout_lock);
 176         spin_lock_init(&cmd->istate_lock);
 177         spin_lock_init(&cmd->error_lock);
 178         spin_lock_init(&cmd->r2t_lock);
 179
 180         return cmd;
 181 }
 182 EXPORT_SYMBOL(iscsit_allocate_cmd);
 183
 184 struct iscsi_seq *iscsit_get_seq_holder_for_datain(
 185         struct iscsi_cmd *cmd,
 186         u32 seq_send_order)
 187 {
 188         u32 i;
 189
 190         for (i = 0; i < cmd->seq_count; i++)
 191                 if (cmd->seq_list[i].seq_send_order == seq_send_order)
 192                         return &cmd->seq_list[i];
 193
 194         return NULL;
 195 }
 196
 197 struct iscsi_seq *iscsit_get_seq_holder_for_r2t(struct iscsi_cmd *cmd)
 198 {
 199         u32 i;
 200
 201         if (!cmd->seq_list) {
 202                 pr_err("struct iscsi_cmd->seq_list is NULL!\n");
 203                 return NULL;
 204         }
 205
 206         for (i = 0; i < cmd->seq_count; i++) {
 207                 if (cmd->seq_list[i].type != SEQTYPE_NORMAL)
 208                         continue;
 209                 if (cmd->seq_list[i].seq_send_order == cmd->seq_send_order) {
 210                         cmd->seq_send_order++;
 211                         return &cmd->seq_list[i];
 212                 }
 213         }
 214
 215         return NULL;
 216 }
 217
 218 struct iscsi_r2t *iscsit_get_holder_for_r2tsn(
 219         struct iscsi_cmd *cmd,
 220         u32 r2t_sn)
 221 {
 222         struct iscsi_r2t *r2t;
 223
 224         spin_lock_bh(&cmd->r2t_lock);
 225         list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
 226                 if (r2t->r2t_sn == r2t_sn) {
 227                         spin_unlock_bh(&cmd->r2t_lock);
 228                         return r2t;
 229                 }
 230         }
 231         spin_unlock_bh(&cmd->r2t_lock);
 232
 233         return NULL;
 234 }
 235
 236 static inline int iscsit_check_received_cmdsn(struct iscsi_session *sess, u32 cmdsn)
 237 {
 238         u32 max_cmdsn;
 239         int ret;
 240
 241         /*
 242          * This is the proper method of checking received CmdSN against
 243          * ExpCmdSN and MaxCmdSN values, as well as accounting for out
 244          * or order CmdSNs due to multiple connection sessions and/or
 245          * CRC failures.
 246          */
 247         max_cmdsn = atomic_read(&sess->max_cmd_sn);
 248         if (iscsi_sna_gt(cmdsn, max_cmdsn)) {
 249                 pr_err("Received CmdSN: 0x%08x is greater than"
 250                        " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn, max_cmdsn);
 251                 ret = CMDSN_MAXCMDSN_OVERRUN;
 252
 253         } else if (cmdsn == sess->exp_cmd_sn) {
 254                 sess->exp_cmd_sn++;
 255                 pr_debug("Received CmdSN matches ExpCmdSN,"
 256                       " incremented ExpCmdSN to: 0x%08x\n",
 257                       sess->exp_cmd_sn);
 258                 ret = CMDSN_NORMAL_OPERATION;
 259
 260         } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
 261                 pr_debug("Received CmdSN: 0x%08x is greater"
 262                       " than ExpCmdSN: 0x%08x, not acknowledging.\n",
 263                       cmdsn, sess->exp_cmd_sn);
 264                 ret = CMDSN_HIGHER_THAN_EXP;
 265
 266         } else {
 267                 pr_err("Received CmdSN: 0x%08x is less than"
 268                        " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
 269                        sess->exp_cmd_sn);
 270                 ret = CMDSN_LOWER_THAN_EXP;
 271         }
 272
 273         return ret;
 274 }
 275
 276 /*
 277  * Commands may be received out of order if MC/S is in use.
 278  * Ensure they are executed in CmdSN order.
 279  */
 280 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 281                         unsigned char *buf, __be32 cmdsn)
 282 {
 283         int ret, cmdsn_ret;
 284         bool reject = false;
 285         u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
 286
 287         mutex_lock(&conn->sess->cmdsn_mutex);
 288
 289         cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
 290         switch (cmdsn_ret) {
 291         case CMDSN_NORMAL_OPERATION:
 292                 ret = iscsit_execute_cmd(cmd, 0);
 293                 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
 294                         iscsit_execute_ooo_cmdsns(conn->sess);
 295                 else if (ret < 0) {
 296                         reject = true;
 297                         ret = CMDSN_ERROR_CANNOT_RECOVER;
 298                 }
 299                 break;
 300         case CMDSN_HIGHER_THAN_EXP:
 301                 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
 302                 if (ret < 0) {
 303                         reject = true;
 304                         ret = CMDSN_ERROR_CANNOT_RECOVER;
 305                         break;
 306                 }
 307                 ret = CMDSN_HIGHER_THAN_EXP;
 308                 break;
 309         case CMDSN_LOWER_THAN_EXP:
 310         case CMDSN_MAXCMDSN_OVERRUN:
 311         default:
 312                 cmd->i_state = ISTATE_REMOVE;
 313                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
 314                 /*
 315                  * Existing callers for iscsit_sequence_cmd() will silently
 316                  * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
 317                  * return for CMDSN_MAXCMDSN_OVERRUN as well..
 318                  */
 319                 ret = CMDSN_LOWER_THAN_EXP;
 320                 break;
 321         }
 322         mutex_unlock(&conn->sess->cmdsn_mutex);
 323
 324         if (reject)
 325                 iscsit_reject_cmd(cmd, reason, buf);
 326
 327         return ret;
 328 }
 329 EXPORT_SYMBOL(iscsit_sequence_cmd);
 330
 331 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
 332 {
 333         struct iscsi_conn *conn = cmd->conn;
 334         struct se_cmd *se_cmd = &cmd->se_cmd;
 335         struct iscsi_data *hdr = (struct iscsi_data *) buf;
 336         u32 payload_length = ntoh24(hdr->dlength);
 337
 338         if (conn->sess->sess_ops->InitialR2T) {
 339                 pr_err("Received unexpected unsolicited data"
 340                         " while InitialR2T=Yes, protocol error.\n");
 341                 transport_send_check_condition_and_sense(se_cmd,
 342                                 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
 343                 return -1;
 344         }
 345
 346         if ((cmd->first_burst_len + payload_length) >
 347              conn->sess->sess_ops->FirstBurstLength) {
 348                 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
 349                         " for this Unsolicited DataOut Burst.\n",
 350                         (cmd->first_burst_len + payload_length),
 351                                 conn->sess->sess_ops->FirstBurstLength);
 352                 transport_send_check_condition_and_sense(se_cmd,
 353                                 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
 354                 return -1;
 355         }
 356
 357         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
 358                 return 0;
 359
 360         if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
 361             ((cmd->first_burst_len + payload_length) !=
 362               conn->sess->sess_ops->FirstBurstLength)) {
 363                 pr_err("Unsolicited non-immediate data received %u"
 364                         " does not equal FirstBurstLength: %u, and does"
 365                         " not equal ExpXferLen %u.\n",
 366                         (cmd->first_burst_len + payload_length),
 367                         conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
 368                 transport_send_check_condition_and_sense(se_cmd,
 369                                 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
 370                 return -1;
 371         }
 372         return 0;
 373 }
 374
 375 struct iscsi_cmd *iscsit_find_cmd_from_itt(
 376         struct iscsi_conn *conn,
 377         itt_t init_task_tag)
 378 {
 379         struct iscsi_cmd *cmd;
 380
 381         spin_lock_bh(&conn->cmd_lock);
 382         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 383                 if (cmd->init_task_tag == init_task_tag) {
 384                         spin_unlock_bh(&conn->cmd_lock);
 385                         return cmd;
 386                 }
 387         }
 388         spin_unlock_bh(&conn->cmd_lock);
 389
 390         pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
 391                         init_task_tag, conn->cid);
 392         return NULL;
 393 }
 394 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
 395
 396 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
 397         struct iscsi_conn *conn,
 398         itt_t init_task_tag,
 399         u32 length)
 400 {
 401         struct iscsi_cmd *cmd;
 402
 403         spin_lock_bh(&conn->cmd_lock);
 404         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 405                 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
 406                         continue;
 407                 if (cmd->init_task_tag == init_task_tag) {
 408                         spin_unlock_bh(&conn->cmd_lock);
 409                         return cmd;
 410                 }
 411         }
 412         spin_unlock_bh(&conn->cmd_lock);
 413
 414         pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
 415                         " dumping payload\n", init_task_tag, conn->cid);
 416         if (length)
 417                 iscsit_dump_data_payload(conn, length, 1);
 418
 419         return NULL;
 420 }
 421 EXPORT_SYMBOL(iscsit_find_cmd_from_itt_or_dump);
 422
 423 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
 424         struct iscsi_conn *conn,
 425         u32 targ_xfer_tag)
 426 {
 427         struct iscsi_cmd *cmd = NULL;
 428
 429         spin_lock_bh(&conn->cmd_lock);
 430         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 431                 if (cmd->targ_xfer_tag == targ_xfer_tag) {
 432                         spin_unlock_bh(&conn->cmd_lock);
 433                         return cmd;
 434                 }
 435         }
 436         spin_unlock_bh(&conn->cmd_lock);
 437
 438         pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
 439                         targ_xfer_tag, conn->cid);
 440         return NULL;
 441 }
 442
 443 int iscsit_find_cmd_for_recovery(
 444         struct iscsi_session *sess,
 445         struct iscsi_cmd **cmd_ptr,
 446         struct iscsi_conn_recovery **cr_ptr,
 447         itt_t init_task_tag)
 448 {
 449         struct iscsi_cmd *cmd = NULL;
 450         struct iscsi_conn_recovery *cr;
 451         /*
 452          * Scan through the inactive connection recovery list's command list.
 453          * If init_task_tag matches the command is still alligent.
 454          */
 455         spin_lock(&sess->cr_i_lock);
 456         list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
 457                 spin_lock(&cr->conn_recovery_cmd_lock);
 458                 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
 459                         if (cmd->init_task_tag == init_task_tag) {
 460                                 spin_unlock(&cr->conn_recovery_cmd_lock);
 461                                 spin_unlock(&sess->cr_i_lock);
 462
 463                                 *cr_ptr = cr;
 464                                 *cmd_ptr = cmd;
 465                                 return -2;
 466                         }
 467                 }
 468                 spin_unlock(&cr->conn_recovery_cmd_lock);
 469         }
 470         spin_unlock(&sess->cr_i_lock);
 471         /*
 472          * Scan through the active connection recovery list's command list.
 473          * If init_task_tag matches the command is ready to be reassigned.
 474          */
 475         spin_lock(&sess->cr_a_lock);
 476         list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
 477                 spin_lock(&cr->conn_recovery_cmd_lock);
 478                 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
 479                         if (cmd->init_task_tag == init_task_tag) {
 480                                 spin_unlock(&cr->conn_recovery_cmd_lock);
 481                                 spin_unlock(&sess->cr_a_lock);
 482
 483                                 *cr_ptr = cr;
 484                                 *cmd_ptr = cmd;
 485                                 return 0;
 486                         }
 487                 }
 488                 spin_unlock(&cr->conn_recovery_cmd_lock);
 489         }
 490         spin_unlock(&sess->cr_a_lock);
 491
 492         return -1;
 493 }
 494
 495 void iscsit_add_cmd_to_immediate_queue(
 496         struct iscsi_cmd *cmd,
 497         struct iscsi_conn *conn,
 498         u8 state)
 499 {
 500         struct iscsi_queue_req *qr;
 501
 502         qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
 503         if (!qr) {
 504                 pr_err("Unable to allocate memory for"
 505                                 " struct iscsi_queue_req\n");
 506                 return;
 507         }
 508         INIT_LIST_HEAD(&qr->qr_list);
 509         qr->cmd = cmd;
 510         qr->state = state;
 511
 512         spin_lock_bh(&conn->immed_queue_lock);
 513         list_add_tail(&qr->qr_list, &conn->immed_queue_list);
 514         atomic_inc(&cmd->immed_queue_count);
 515         atomic_set(&conn->check_immediate_queue, 1);
 516         spin_unlock_bh(&conn->immed_queue_lock);
 517
 518         wake_up(&conn->queues_wq);
 519 }
 520 EXPORT_SYMBOL(iscsit_add_cmd_to_immediate_queue);
 521
 522 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
 523 {
 524         struct iscsi_queue_req *qr;
 525
 526         spin_lock_bh(&conn->immed_queue_lock);
 527         if (list_empty(&conn->immed_queue_list)) {
 528                 spin_unlock_bh(&conn->immed_queue_lock);
 529                 return NULL;
 530         }
 531         qr = list_first_entry(&conn->immed_queue_list,
 532                               struct iscsi_queue_req, qr_list);
 533
 534         list_del(&qr->qr_list);
 535         if (qr->cmd)
 536                 atomic_dec(&qr->cmd->immed_queue_count);
 537         spin_unlock_bh(&conn->immed_queue_lock);
 538
 539         return qr;
 540 }
 541
 542 static void iscsit_remove_cmd_from_immediate_queue(
 543         struct iscsi_cmd *cmd,
 544         struct iscsi_conn *conn)
 545 {
 546         struct iscsi_queue_req *qr, *qr_tmp;
 547
 548         spin_lock_bh(&conn->immed_queue_lock);
 549         if (!atomic_read(&cmd->immed_queue_count)) {
 550                 spin_unlock_bh(&conn->immed_queue_lock);
 551                 return;
 552         }
 553
 554         list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
 555                 if (qr->cmd != cmd)
 556                         continue;
 557
 558                 atomic_dec(&qr->cmd->immed_queue_count);
 559                 list_del(&qr->qr_list);
 560                 kmem_cache_free(lio_qr_cache, qr);
 561         }
 562         spin_unlock_bh(&conn->immed_queue_lock);
 563
 564         if (atomic_read(&cmd->immed_queue_count)) {
 565                 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
 566                         cmd->init_task_tag,
 567                         atomic_read(&cmd->immed_queue_count));
 568         }
 569 }
 570
 571 int iscsit_add_cmd_to_response_queue(
 572         struct iscsi_cmd *cmd,
 573         struct iscsi_conn *conn,
 574         u8 state)
 575 {
 576         struct iscsi_queue_req *qr;
 577
 578         qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
 579         if (!qr) {
 580                 pr_err("Unable to allocate memory for"
 581                         " struct iscsi_queue_req\n");
 582                 return -ENOMEM;
 583         }
 584         INIT_LIST_HEAD(&qr->qr_list);
 585         qr->cmd = cmd;
 586         qr->state = state;
 587
 588         spin_lock_bh(&conn->response_queue_lock);
 589         list_add_tail(&qr->qr_list, &conn->response_queue_list);
 590         atomic_inc(&cmd->response_queue_count);
 591         spin_unlock_bh(&conn->response_queue_lock);
 592
 593         wake_up(&conn->queues_wq);
 594         return 0;
 595 }
 596
 597 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
 598 {
 599         struct iscsi_queue_req *qr;
 600
 601         spin_lock_bh(&conn->response_queue_lock);
 602         if (list_empty(&conn->response_queue_list)) {
 603                 spin_unlock_bh(&conn->response_queue_lock);
 604                 return NULL;
 605         }
 606
 607         qr = list_first_entry(&conn->response_queue_list,
 608                               struct iscsi_queue_req, qr_list);
 609
 610         list_del(&qr->qr_list);
 611         if (qr->cmd)
 612                 atomic_dec(&qr->cmd->response_queue_count);
 613         spin_unlock_bh(&conn->response_queue_lock);
 614
 615         return qr;
 616 }
 617
 618 static void iscsit_remove_cmd_from_response_queue(
 619         struct iscsi_cmd *cmd,
 620         struct iscsi_conn *conn)
 621 {
 622         struct iscsi_queue_req *qr, *qr_tmp;
 623
 624         spin_lock_bh(&conn->response_queue_lock);
 625         if (!atomic_read(&cmd->response_queue_count)) {
 626                 spin_unlock_bh(&conn->response_queue_lock);
 627                 return;
 628         }
 629
 630         list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
 631                                 qr_list) {
 632                 if (qr->cmd != cmd)
 633                         continue;
 634
 635                 atomic_dec(&qr->cmd->response_queue_count);
 636                 list_del(&qr->qr_list);
 637                 kmem_cache_free(lio_qr_cache, qr);
 638         }
 639         spin_unlock_bh(&conn->response_queue_lock);
 640
 641         if (atomic_read(&cmd->response_queue_count)) {
 642                 pr_err("ITT: 0x%08x response_queue_count: %d\n",
 643                         cmd->init_task_tag,
 644                         atomic_read(&cmd->response_queue_count));
 645         }
 646 }
 647
 648 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
 649 {
 650         bool empty;
 651
 652         spin_lock_bh(&conn->immed_queue_lock);
 653         empty = list_empty(&conn->immed_queue_list);
 654         spin_unlock_bh(&conn->immed_queue_lock);
 655
 656         if (!empty)
 657                 return empty;
 658
 659         spin_lock_bh(&conn->response_queue_lock);
 660         empty = list_empty(&conn->response_queue_list);
 661         spin_unlock_bh(&conn->response_queue_lock);
 662
 663         return empty;
 664 }
 665
 666 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
 667 {
 668         struct iscsi_queue_req *qr, *qr_tmp;
 669
 670         spin_lock_bh(&conn->immed_queue_lock);
 671         list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
 672                 list_del(&qr->qr_list);
 673                 if (qr->cmd)
 674                         atomic_dec(&qr->cmd->immed_queue_count);
 675
 676                 kmem_cache_free(lio_qr_cache, qr);
 677         }
 678         spin_unlock_bh(&conn->immed_queue_lock);
 679
 680         spin_lock_bh(&conn->response_queue_lock);
 681         list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
 682                         qr_list) {
 683                 list_del(&qr->qr_list);
 684                 if (qr->cmd)
 685                         atomic_dec(&qr->cmd->response_queue_count);
 686
 687                 kmem_cache_free(lio_qr_cache, qr);
 688         }
 689         spin_unlock_bh(&conn->response_queue_lock);
 690 }
 691
 692 void iscsit_release_cmd(struct iscsi_cmd *cmd)
 693 {
 694         struct iscsi_session *sess;
 695         struct se_cmd *se_cmd = &cmd->se_cmd;
 696
 697         if (cmd->conn)
 698                 sess = cmd->conn->sess;
 699         else
 700                 sess = cmd->sess;
 701
 702         BUG_ON(!sess || !sess->se_sess);
 703
 704         kfree(cmd->buf_ptr);
 705         kfree(cmd->pdu_list);
 706         kfree(cmd->seq_list);
 707         kfree(cmd->tmr_req);
 708         kfree(cmd->iov_data);
 709         kfree(cmd->text_in_ptr);
 710
 711         percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
 712 }
 713 EXPORT_SYMBOL(iscsit_release_cmd);
 714
 715 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool check_queues)
 716 {
 717         struct iscsi_conn *conn = cmd->conn;
 718
 719         if (cmd->data_direction == DMA_TO_DEVICE) {
 720                 iscsit_stop_dataout_timer(cmd);
 721                 iscsit_free_r2ts_from_list(cmd);
 722         }
 723         if (cmd->data_direction == DMA_FROM_DEVICE)
 724                 iscsit_free_all_datain_reqs(cmd);
 725
 726         if (conn && check_queues) {
 727                 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
 728                 iscsit_remove_cmd_from_response_queue(cmd, conn);
 729         }
 730
 731         if (conn && conn->conn_transport->iscsit_release_cmd)
 732                 conn->conn_transport->iscsit_release_cmd(conn, cmd);
 733 }
 734
 735 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
 736 {
 737         struct se_cmd *se_cmd = cmd->se_cmd.se_tfo ? &cmd->se_cmd : NULL;
 738         int rc;
 739
 740         __iscsit_free_cmd(cmd, shutdown);
 741         if (se_cmd) {
 742                 rc = transport_generic_free_cmd(se_cmd, shutdown);
 743                 if (!rc && shutdown && se_cmd->se_sess) {
 744                         __iscsit_free_cmd(cmd, shutdown);
 745                         target_put_sess_cmd(se_cmd);
 746                 }
 747         } else {
 748                 iscsit_release_cmd(cmd);
 749         }
 750 }
 751 EXPORT_SYMBOL(iscsit_free_cmd);
 752
 753 int iscsit_check_session_usage_count(struct iscsi_session *sess)
 754 {
 755         spin_lock_bh(&sess->session_usage_lock);
 756         if (sess->session_usage_count != 0) {
 757                 sess->session_waiting_on_uc = 1;
 758                 spin_unlock_bh(&sess->session_usage_lock);
 759                 if (in_interrupt())
 760                         return 2;
 761
 762                 wait_for_completion(&sess->session_waiting_on_uc_comp);
 763                 return 1;
 764         }
 765         spin_unlock_bh(&sess->session_usage_lock);
 766
 767         return 0;
 768 }
 769
 770 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
 771 {
 772         spin_lock_bh(&sess->session_usage_lock);
 773         sess->session_usage_count--;
 774
 775         if (!sess->session_usage_count && sess->session_waiting_on_uc)
 776                 complete(&sess->session_waiting_on_uc_comp);
 777
 778         spin_unlock_bh(&sess->session_usage_lock);
 779 }
 780
 781 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
 782 {
 783         spin_lock_bh(&sess->session_usage_lock);
 784         sess->session_usage_count++;
 785         spin_unlock_bh(&sess->session_usage_lock);
 786 }
 787
 788 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
 789 {
 790         struct iscsi_conn *conn;
 791
 792         spin_lock_bh(&sess->conn_lock);
 793         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
 794                 if ((conn->cid == cid) &&
 795                     (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
 796                         iscsit_inc_conn_usage_count(conn);
 797                         spin_unlock_bh(&sess->conn_lock);
 798                         return conn;
 799                 }
 800         }
 801         spin_unlock_bh(&sess->conn_lock);
 802
 803         return NULL;
 804 }
 805
 806 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
 807 {
 808         struct iscsi_conn *conn;
 809
 810         spin_lock_bh(&sess->conn_lock);
 811         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
 812                 if (conn->cid == cid) {
 813                         iscsit_inc_conn_usage_count(conn);
 814                         spin_lock(&conn->state_lock);
 815                         atomic_set(&conn->connection_wait_rcfr, 1);
 816                         spin_unlock(&conn->state_lock);
 817                         spin_unlock_bh(&sess->conn_lock);
 818                         return conn;
 819                 }
 820         }
 821         spin_unlock_bh(&sess->conn_lock);
 822
 823         return NULL;
 824 }
 825
 826 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
 827 {
 828         spin_lock_bh(&conn->conn_usage_lock);
 829         if (conn->conn_usage_count != 0) {
 830                 conn->conn_waiting_on_uc = 1;
 831                 spin_unlock_bh(&conn->conn_usage_lock);
 832
 833                 wait_for_completion(&conn->conn_waiting_on_uc_comp);
 834                 return;
 835         }
 836         spin_unlock_bh(&conn->conn_usage_lock);
 837 }
 838
 839 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
 840 {
 841         spin_lock_bh(&conn->conn_usage_lock);
 842         conn->conn_usage_count--;
 843
 844         if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
 845                 complete(&conn->conn_waiting_on_uc_comp);
 846
 847         spin_unlock_bh(&conn->conn_usage_lock);
 848 }
 849
 850 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
 851 {
 852         spin_lock_bh(&conn->conn_usage_lock);
 853         conn->conn_usage_count++;
 854         spin_unlock_bh(&conn->conn_usage_lock);
 855 }
 856
 857 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
 858 {
 859         u8 state;
 860         struct iscsi_cmd *cmd;
 861
 862         cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
 863         if (!cmd)
 864                 return -1;
 865
 866         cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
 867         state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
 868                                 ISTATE_SEND_NOPIN_NO_RESPONSE;
 869         cmd->init_task_tag = RESERVED_ITT;
 870         cmd->targ_xfer_tag = (want_response) ?
 871                              session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
 872         spin_lock_bh(&conn->cmd_lock);
 873         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 874         spin_unlock_bh(&conn->cmd_lock);
 875
 876         if (want_response)
 877                 iscsit_start_nopin_response_timer(conn);
 878         iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
 879
 880         return 0;
 881 }
 882
 883 static void iscsit_handle_nopin_response_timeout(unsigned long data)
 884 {
 885         struct iscsi_conn *conn = (struct iscsi_conn *) data;
 886
 887         iscsit_inc_conn_usage_count(conn);
 888
 889         spin_lock_bh(&conn->nopin_timer_lock);
 890         if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
 891                 spin_unlock_bh(&conn->nopin_timer_lock);
 892                 iscsit_dec_conn_usage_count(conn);
 893                 return;
 894         }
 895
 896         pr_debug("Did not receive response to NOPIN on CID: %hu on"
 897                 " SID: %u, failing connection.\n", conn->cid,
 898                         conn->sess->sid);
 899         conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
 900         spin_unlock_bh(&conn->nopin_timer_lock);
 901
 902         {
 903         struct iscsi_portal_group *tpg = conn->sess->tpg;
 904         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 905
 906         if (tiqn) {
 907                 spin_lock_bh(&tiqn->sess_err_stats.lock);
 908                 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
 909                                 conn->sess->sess_ops->InitiatorName);
 910                 tiqn->sess_err_stats.last_sess_failure_type =
 911                                 ISCSI_SESS_ERR_CXN_TIMEOUT;
 912                 tiqn->sess_err_stats.cxn_timeout_errors++;
 913                 atomic_long_inc(&conn->sess->conn_timeout_errors);
 914                 spin_unlock_bh(&tiqn->sess_err_stats.lock);
 915         }
 916         }
 917
 918         iscsit_cause_connection_reinstatement(conn, 0);
 919         iscsit_dec_conn_usage_count(conn);
 920 }
 921
 922 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
 923 {
 924         struct iscsi_session *sess = conn->sess;
 925         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
 926
 927         spin_lock_bh(&conn->nopin_timer_lock);
 928         if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
 929                 spin_unlock_bh(&conn->nopin_timer_lock);
 930                 return;
 931         }
 932
 933         mod_timer(&conn->nopin_response_timer,
 934                 (get_jiffies_64() + na->nopin_response_timeout * HZ));
 935         spin_unlock_bh(&conn->nopin_timer_lock);
 936 }
 937
 938 /*
 939  *      Called with conn->nopin_timer_lock held.
 940  */
 941 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
 942 {
 943         struct iscsi_session *sess = conn->sess;
 944         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
 945
 946         spin_lock_bh(&conn->nopin_timer_lock);
 947         if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
 948                 spin_unlock_bh(&conn->nopin_timer_lock);
 949                 return;
 950         }
 951
 952         init_timer(&conn->nopin_response_timer);
 953         conn->nopin_response_timer.expires =
 954                 (get_jiffies_64() + na->nopin_response_timeout * HZ);
 955         conn->nopin_response_timer.data = (unsigned long)conn;
 956         conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
 957         conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
 958         conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
 959         add_timer(&conn->nopin_response_timer);
 960
 961         pr_debug("Started NOPIN Response Timer on CID: %d to %u"
 962                 " seconds\n", conn->cid, na->nopin_response_timeout);
 963         spin_unlock_bh(&conn->nopin_timer_lock);
 964 }
 965
 966 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
 967 {
 968         spin_lock_bh(&conn->nopin_timer_lock);
 969         if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
 970                 spin_unlock_bh(&conn->nopin_timer_lock);
 971                 return;
 972         }
 973         conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
 974         spin_unlock_bh(&conn->nopin_timer_lock);
 975
 976         del_timer_sync(&conn->nopin_response_timer);
 977
 978         spin_lock_bh(&conn->nopin_timer_lock);
 979         conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
 980         spin_unlock_bh(&conn->nopin_timer_lock);
 981 }
 982
 983 static void iscsit_handle_nopin_timeout(unsigned long data)
 984 {
 985         struct iscsi_conn *conn = (struct iscsi_conn *) data;
 986
 987         iscsit_inc_conn_usage_count(conn);
 988
 989         spin_lock_bh(&conn->nopin_timer_lock);
 990         if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
 991                 spin_unlock_bh(&conn->nopin_timer_lock);
 992                 iscsit_dec_conn_usage_count(conn);
 993                 return;
 994         }
 995         conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
 996         spin_unlock_bh(&conn->nopin_timer_lock);
 997
 998         iscsit_add_nopin(conn, 1);
 999         iscsit_dec_conn_usage_count(conn);
1000 }
1001
1002 /*
1003  * Called with conn->nopin_timer_lock held.
1004  */
1005 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1006 {
1007         struct iscsi_session *sess = conn->sess;
1008         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1009         /*
1010         * NOPIN timeout is disabled.
1011          */
1012         if (!na->nopin_timeout)
1013                 return;
1014
1015         if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1016                 return;
1017
1018         init_timer(&conn->nopin_timer);
1019         conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1020         conn->nopin_timer.data = (unsigned long)conn;
1021         conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1022         conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1023         conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1024         add_timer(&conn->nopin_timer);
1025
1026         pr_debug("Started NOPIN Timer on CID: %d at %u second"
1027                 " interval\n", conn->cid, na->nopin_timeout);
1028 }
1029
1030 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1031 {
1032         struct iscsi_session *sess = conn->sess;
1033         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1034         /*
1035          * NOPIN timeout is disabled..
1036          */
1037         if (!na->nopin_timeout)
1038                 return;
1039
1040         spin_lock_bh(&conn->nopin_timer_lock);
1041         if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1042                 spin_unlock_bh(&conn->nopin_timer_lock);
1043                 return;
1044         }
1045
1046         init_timer(&conn->nopin_timer);
1047         conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1048         conn->nopin_timer.data = (unsigned long)conn;
1049         conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1050         conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1051         conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1052         add_timer(&conn->nopin_timer);
1053
1054         pr_debug("Started NOPIN Timer on CID: %d at %u second"
1055                         " interval\n", conn->cid, na->nopin_timeout);
1056         spin_unlock_bh(&conn->nopin_timer_lock);
1057 }
1058
1059 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1060 {
1061         spin_lock_bh(&conn->nopin_timer_lock);
1062         if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1063                 spin_unlock_bh(&conn->nopin_timer_lock);
1064                 return;
1065         }
1066         conn->nopin_timer_flags |= ISCSI_TF_STOP;
1067         spin_unlock_bh(&conn->nopin_timer_lock);
1068
1069         del_timer_sync(&conn->nopin_timer);
1070
1071         spin_lock_bh(&conn->nopin_timer_lock);
1072         conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1073         spin_unlock_bh(&conn->nopin_timer_lock);
1074 }
1075
1076 int iscsit_send_tx_data(
1077         struct iscsi_cmd *cmd,
1078         struct iscsi_conn *conn,
1079         int use_misc)
1080 {
1081         int tx_sent, tx_size;
1082         u32 iov_count;
1083         struct kvec *iov;
1084
1085 send_data:
1086         tx_size = cmd->tx_size;
1087
1088         if (!use_misc) {
1089                 iov = &cmd->iov_data[0];
1090                 iov_count = cmd->iov_data_count;
1091         } else {
1092                 iov = &cmd->iov_misc[0];
1093                 iov_count = cmd->iov_misc_count;
1094         }
1095
1096         tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1097         if (tx_size != tx_sent) {
1098                 if (tx_sent == -EAGAIN) {
1099                         pr_err("tx_data() returned -EAGAIN\n");
1100                         goto send_data;
1101                 } else
1102                         return -1;
1103         }
1104         cmd->tx_size = 0;
1105
1106         return 0;
1107 }
1108
1109 int iscsit_fe_sendpage_sg(
1110         struct iscsi_cmd *cmd,
1111         struct iscsi_conn *conn)
1112 {
1113         struct scatterlist *sg = cmd->first_data_sg;
1114         struct kvec iov;
1115         u32 tx_hdr_size, data_len;
1116         u32 offset = cmd->first_data_sg_off;
1117         int tx_sent, iov_off;
1118
1119 send_hdr:
1120         tx_hdr_size = ISCSI_HDR_LEN;
1121         if (conn->conn_ops->HeaderDigest)
1122                 tx_hdr_size += ISCSI_CRC_LEN;
1123
1124         iov.iov_base = cmd->pdu;
1125         iov.iov_len = tx_hdr_size;
1126
1127         tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1128         if (tx_hdr_size != tx_sent) {
1129                 if (tx_sent == -EAGAIN) {
1130                         pr_err("tx_data() returned -EAGAIN\n");
1131                         goto send_hdr;
1132                 }
1133                 return -1;
1134         }
1135
1136         data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1137         /*
1138          * Set iov_off used by padding and data digest tx_data() calls below
1139          * in order to determine proper offset into cmd->iov_data[]
1140          */
1141         if (conn->conn_ops->DataDigest) {
1142                 data_len -= ISCSI_CRC_LEN;
1143                 if (cmd->padding)
1144                         iov_off = (cmd->iov_data_count - 2);
1145                 else
1146                         iov_off = (cmd->iov_data_count - 1);
1147         } else {
1148                 iov_off = (cmd->iov_data_count - 1);
1149         }
1150         /*
1151          * Perform sendpage() for each page in the scatterlist
1152          */
1153         while (data_len) {
1154                 u32 space = (sg->length - offset);
1155                 u32 sub_len = min_t(u32, data_len, space);
1156 send_pg:
1157                 tx_sent = conn->sock->ops->sendpage(conn->sock,
1158                                         sg_page(sg), sg->offset + offset, sub_len, 0);
1159                 if (tx_sent != sub_len) {
1160                         if (tx_sent == -EAGAIN) {
1161                                 pr_err("tcp_sendpage() returned"
1162                                                 " -EAGAIN\n");
1163                                 goto send_pg;
1164                         }
1165
1166                         pr_err("tcp_sendpage() failure: %d\n",
1167                                         tx_sent);
1168                         return -1;
1169                 }
1170
1171                 data_len -= sub_len;
1172                 offset = 0;
1173                 sg = sg_next(sg);
1174         }
1175
1176 send_padding:
1177         if (cmd->padding) {
1178                 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1179
1180                 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1181                 if (cmd->padding != tx_sent) {
1182                         if (tx_sent == -EAGAIN) {
1183                                 pr_err("tx_data() returned -EAGAIN\n");
1184                                 goto send_padding;
1185                         }
1186                         return -1;
1187                 }
1188         }
1189
1190 send_datacrc:
1191         if (conn->conn_ops->DataDigest) {
1192                 struct kvec *iov_d = &cmd->iov_data[iov_off];
1193
1194                 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1195                 if (ISCSI_CRC_LEN != tx_sent) {
1196                         if (tx_sent == -EAGAIN) {
1197                                 pr_err("tx_data() returned -EAGAIN\n");
1198                                 goto send_datacrc;
1199                         }
1200                         return -1;
1201                 }
1202         }
1203
1204         return 0;
1205 }
1206
1207 /*
1208  *      This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1209  *      back to the Initiator when an expection condition occurs with the
1210  *      errors set in status_class and status_detail.
1211  *
1212  *      Parameters:     iSCSI Connection, Status Class, Status Detail.
1213  *      Returns:        0 on success, -1 on error.
1214  */
1215 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1216 {
1217         struct iscsi_login_rsp *hdr;
1218         struct iscsi_login *login = conn->conn_login;
1219
1220         login->login_failed = 1;
1221         iscsit_collect_login_stats(conn, status_class, status_detail);
1222
1223         memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1224
1225         hdr     = (struct iscsi_login_rsp *)&login->rsp[0];
1226         hdr->opcode             = ISCSI_OP_LOGIN_RSP;
1227         hdr->status_class       = status_class;
1228         hdr->status_detail      = status_detail;
1229         hdr->itt                = conn->login_itt;
1230
1231         return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1232 }
1233
1234 void iscsit_print_session_params(struct iscsi_session *sess)
1235 {
1236         struct iscsi_conn *conn;
1237
1238         pr_debug("-----------------------------[Session Params for"
1239                 " SID: %u]-----------------------------\n", sess->sid);
1240         spin_lock_bh(&sess->conn_lock);
1241         list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1242                 iscsi_dump_conn_ops(conn->conn_ops);
1243         spin_unlock_bh(&sess->conn_lock);
1244
1245         iscsi_dump_sess_ops(sess->sess_ops);
1246 }
1247
1248 static int iscsit_do_rx_data(
1249         struct iscsi_conn *conn,
1250         struct iscsi_data_count *count)
1251 {
1252         int data = count->data_length, rx_loop = 0, total_rx = 0;
1253         struct msghdr msg;
1254
1255         if (!conn || !conn->sock || !conn->conn_ops)
1256                 return -1;
1257
1258         memset(&msg, 0, sizeof(struct msghdr));
1259         iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1260                       count->iov, count->iov_count, data);
1261
1262         while (msg_data_left(&msg)) {
1263                 rx_loop = sock_recvmsg(conn->sock, &msg, MSG_WAITALL);
1264                 if (rx_loop <= 0) {
1265                         pr_debug("rx_loop: %d total_rx: %d\n",
1266                                 rx_loop, total_rx);
1267                         return rx_loop;
1268                 }
1269                 total_rx += rx_loop;
1270                 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1271                                 rx_loop, total_rx, data);
1272         }
1273
1274         return total_rx;
1275 }
1276
1277 int rx_data(
1278         struct iscsi_conn *conn,
1279         struct kvec *iov,
1280         int iov_count,
1281         int data)
1282 {
1283         struct iscsi_data_count c;
1284
1285         if (!conn || !conn->sock || !conn->conn_ops)
1286                 return -1;
1287
1288         memset(&c, 0, sizeof(struct iscsi_data_count));
1289         c.iov = iov;
1290         c.iov_count = iov_count;
1291         c.data_length = data;
1292         c.type = ISCSI_RX_DATA;
1293
1294         return iscsit_do_rx_data(conn, &c);
1295 }
1296
1297 int tx_data(
1298         struct iscsi_conn *conn,
1299         struct kvec *iov,
1300         int iov_count,
1301         int data)
1302 {
1303         struct msghdr msg;
1304         int total_tx = 0;
1305
1306         if (!conn || !conn->sock || !conn->conn_ops)
1307                 return -1;
1308
1309         if (data <= 0) {
1310                 pr_err("Data length is: %d\n", data);
1311                 return -1;
1312         }
1313
1314         memset(&msg, 0, sizeof(struct msghdr));
1315
1316         iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC,
1317                       iov, iov_count, data);
1318
1319         while (msg_data_left(&msg)) {
1320                 int tx_loop = sock_sendmsg(conn->sock, &msg);
1321                 if (tx_loop <= 0) {
1322                         pr_debug("tx_loop: %d total_tx %d\n",
1323                                 tx_loop, total_tx);
1324                         return tx_loop;
1325                 }
1326                 total_tx += tx_loop;
1327                 pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
1328                                         tx_loop, total_tx, data);
1329         }
1330
1331         return total_tx;
1332 }
1333
1334 void iscsit_collect_login_stats(
1335         struct iscsi_conn *conn,
1336         u8 status_class,
1337         u8 status_detail)
1338 {
1339         struct iscsi_param *intrname = NULL;
1340         struct iscsi_tiqn *tiqn;
1341         struct iscsi_login_stats *ls;
1342
1343         tiqn = iscsit_snmp_get_tiqn(conn);
1344         if (!tiqn)
1345                 return;
1346
1347         ls = &tiqn->login_stats;
1348
1349         spin_lock(&ls->lock);
1350         if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1351                 ls->accepts++;
1352         else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1353                 ls->redirects++;
1354                 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1355         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR)  &&
1356                  (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1357                 ls->authenticate_fails++;
1358                 ls->last_fail_type =  ISCSI_LOGIN_FAIL_AUTHENTICATE;
1359         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR)  &&
1360                  (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1361                 ls->authorize_fails++;
1362                 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1363         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1364                  (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1365                 ls->negotiate_fails++;
1366                 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1367         } else {
1368                 ls->other_fails++;
1369                 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1370         }
1371
1372         /* Save initiator name, ip address and time, if it is a failed login */
1373         if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1374                 if (conn->param_list)
1375                         intrname = iscsi_find_param_from_key(INITIATORNAME,
1376                                                              conn->param_list);
1377                 strlcpy(ls->last_intr_fail_name,
1378                        (intrname ? intrname->value : "Unknown"),
1379                        sizeof(ls->last_intr_fail_name));
1380
1381                 ls->last_intr_fail_ip_family = conn->login_family;
1382
1383                 ls->last_intr_fail_sockaddr = conn->login_sockaddr;
1384                 ls->last_fail_time = get_jiffies_64();
1385         }
1386
1387         spin_unlock(&ls->lock);
1388 }
1389
1390 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1391 {
1392         struct iscsi_portal_group *tpg;
1393
1394         if (!conn)
1395                 return NULL;
1396
1397         tpg = conn->tpg;
1398         if (!tpg)
1399                 return NULL;
1400
1401         if (!tpg->tpg_tiqn)
1402                 return NULL;
1403
1404         return tpg->tpg_tiqn;
1405 }