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 <scsi/scsi_tcq.h>
  22 #include <scsi/iscsi_proto.h>
  23 #include <target/target_core_base.h>
  24 #include <target/target_core_fabric.h>
  25 #include <target/target_core_configfs.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_tq.h"
  37 #include "iscsi_target_util.h"
  38 #include "iscsi_target.h"
  39
  40 #define PRINT_BUFF(buff, len)                                   \
  41 {                                                               \
  42         int zzz;                                                \
  43                                                                 \
  44         pr_debug("%d:\n", __LINE__);                            \
  45         for (zzz = 0; zzz < len; zzz++) {                       \
  46                 if (zzz % 16 == 0) {                            \
  47                         if (zzz)                                \
  48                                 pr_debug("\n");                 \
  49                         pr_debug("%4i: ", zzz);                 \
  50                 }                                               \
  51                 pr_debug("%02x ", (unsigned char) (buff)[zzz]); \
  52         }                                                       \
  53         if ((len + 1) % 16)                                     \
  54                 pr_debug("\n");                                 \
  55 }
  56
  57 extern struct list_head g_tiqn_list;
  58 extern spinlock_t tiqn_lock;
  59
  60 /*
  61  *      Called with cmd->r2t_lock held.
  62  */
  63 int iscsit_add_r2t_to_list(
  64         struct iscsi_cmd *cmd,
  65         u32 offset,
  66         u32 xfer_len,
  67         int recovery,
  68         u32 r2t_sn)
  69 {
  70         struct iscsi_r2t *r2t;
  71
  72         r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC);
  73         if (!r2t) {
  74                 pr_err("Unable to allocate memory for struct iscsi_r2t.\n");
  75                 return -1;
  76         }
  77         INIT_LIST_HEAD(&r2t->r2t_list);
  78
  79         r2t->recovery_r2t = recovery;
  80         r2t->r2t_sn = (!r2t_sn) ? cmd->r2t_sn++ : r2t_sn;
  81         r2t->offset = offset;
  82         r2t->xfer_len = xfer_len;
  83         list_add_tail(&r2t->r2t_list, &cmd->cmd_r2t_list);
  84         spin_unlock_bh(&cmd->r2t_lock);
  85
  86         iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, ISTATE_SEND_R2T);
  87
  88         spin_lock_bh(&cmd->r2t_lock);
  89         return 0;
  90 }
  91
  92 struct iscsi_r2t *iscsit_get_r2t_for_eos(
  93         struct iscsi_cmd *cmd,
  94         u32 offset,
  95         u32 length)
  96 {
  97         struct iscsi_r2t *r2t;
  98
  99         spin_lock_bh(&cmd->r2t_lock);
 100         list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
 101                 if ((r2t->offset <= offset) &&
 102                     (r2t->offset + r2t->xfer_len) >= (offset + length)) {
 103                         spin_unlock_bh(&cmd->r2t_lock);
 104                         return r2t;
 105                 }
 106         }
 107         spin_unlock_bh(&cmd->r2t_lock);
 108
 109         pr_err("Unable to locate R2T for Offset: %u, Length:"
 110                         " %u\n", offset, length);
 111         return NULL;
 112 }
 113
 114 struct iscsi_r2t *iscsit_get_r2t_from_list(struct iscsi_cmd *cmd)
 115 {
 116         struct iscsi_r2t *r2t;
 117
 118         spin_lock_bh(&cmd->r2t_lock);
 119         list_for_each_entry(r2t, &cmd->cmd_r2t_list, r2t_list) {
 120                 if (!r2t->sent_r2t) {
 121                         spin_unlock_bh(&cmd->r2t_lock);
 122                         return r2t;
 123                 }
 124         }
 125         spin_unlock_bh(&cmd->r2t_lock);
 126
 127         pr_err("Unable to locate next R2T to send for ITT:"
 128                         " 0x%08x.\n", cmd->init_task_tag);
 129         return NULL;
 130 }
 131
 132 /*
 133  *      Called with cmd->r2t_lock held.
 134  */
 135 void iscsit_free_r2t(struct iscsi_r2t *r2t, struct iscsi_cmd *cmd)
 136 {
 137         list_del(&r2t->r2t_list);
 138         kmem_cache_free(lio_r2t_cache, r2t);
 139 }
 140
 141 void iscsit_free_r2ts_from_list(struct iscsi_cmd *cmd)
 142 {
 143         struct iscsi_r2t *r2t, *r2t_tmp;
 144
 145         spin_lock_bh(&cmd->r2t_lock);
 146         list_for_each_entry_safe(r2t, r2t_tmp, &cmd->cmd_r2t_list, r2t_list)
 147                 iscsit_free_r2t(r2t, cmd);
 148         spin_unlock_bh(&cmd->r2t_lock);
 149 }
 150
 151 /*
 152  * May be called from software interrupt (timer) context for allocating
 153  * iSCSI NopINs.
 154  */
 155 struct iscsi_cmd *iscsit_allocate_cmd(struct iscsi_conn *conn, int state)
 156 {
 157         struct iscsi_cmd *cmd;
 158         struct se_session *se_sess = conn->sess->se_sess;
 159         int size, tag;
 160
 161         tag = percpu_ida_alloc(&se_sess->sess_tag_pool, state);
 162         if (tag < 0)
 163                 return NULL;
 164
 165         size = sizeof(struct iscsi_cmd) + conn->conn_transport->priv_size;
 166         cmd = (struct iscsi_cmd *)(se_sess->sess_cmd_map + (tag * size));
 167         memset(cmd, 0, size);
 168
 169         cmd->se_cmd.map_tag = tag;
 170         cmd->conn = conn;
 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         int ret;
 239
 240         /*
 241          * This is the proper method of checking received CmdSN against
 242          * ExpCmdSN and MaxCmdSN values, as well as accounting for out
 243          * or order CmdSNs due to multiple connection sessions and/or
 244          * CRC failures.
 245          */
 246         if (iscsi_sna_gt(cmdsn, sess->max_cmd_sn)) {
 247                 pr_err("Received CmdSN: 0x%08x is greater than"
 248                        " MaxCmdSN: 0x%08x, ignoring.\n", cmdsn,
 249                        sess->max_cmd_sn);
 250                 ret = CMDSN_MAXCMDSN_OVERRUN;
 251
 252         } else if (cmdsn == sess->exp_cmd_sn) {
 253                 sess->exp_cmd_sn++;
 254                 pr_debug("Received CmdSN matches ExpCmdSN,"
 255                       " incremented ExpCmdSN to: 0x%08x\n",
 256                       sess->exp_cmd_sn);
 257                 ret = CMDSN_NORMAL_OPERATION;
 258
 259         } else if (iscsi_sna_gt(cmdsn, sess->exp_cmd_sn)) {
 260                 pr_debug("Received CmdSN: 0x%08x is greater"
 261                       " than ExpCmdSN: 0x%08x, not acknowledging.\n",
 262                       cmdsn, sess->exp_cmd_sn);
 263                 ret = CMDSN_HIGHER_THAN_EXP;
 264
 265         } else {
 266                 pr_err("Received CmdSN: 0x%08x is less than"
 267                        " ExpCmdSN: 0x%08x, ignoring.\n", cmdsn,
 268                        sess->exp_cmd_sn);
 269                 ret = CMDSN_LOWER_THAN_EXP;
 270         }
 271
 272         return ret;
 273 }
 274
 275 /*
 276  * Commands may be received out of order if MC/S is in use.
 277  * Ensure they are executed in CmdSN order.
 278  */
 279 int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 280                         unsigned char *buf, __be32 cmdsn)
 281 {
 282         int ret, cmdsn_ret;
 283         bool reject = false;
 284         u8 reason = ISCSI_REASON_BOOKMARK_NO_RESOURCES;
 285
 286         mutex_lock(&conn->sess->cmdsn_mutex);
 287
 288         cmdsn_ret = iscsit_check_received_cmdsn(conn->sess, be32_to_cpu(cmdsn));
 289         switch (cmdsn_ret) {
 290         case CMDSN_NORMAL_OPERATION:
 291                 ret = iscsit_execute_cmd(cmd, 0);
 292                 if ((ret >= 0) && !list_empty(&conn->sess->sess_ooo_cmdsn_list))
 293                         iscsit_execute_ooo_cmdsns(conn->sess);
 294                 else if (ret < 0) {
 295                         reject = true;
 296                         ret = CMDSN_ERROR_CANNOT_RECOVER;
 297                 }
 298                 break;
 299         case CMDSN_HIGHER_THAN_EXP:
 300                 ret = iscsit_handle_ooo_cmdsn(conn->sess, cmd, be32_to_cpu(cmdsn));
 301                 if (ret < 0) {
 302                         reject = true;
 303                         ret = CMDSN_ERROR_CANNOT_RECOVER;
 304                         break;
 305                 }
 306                 ret = CMDSN_HIGHER_THAN_EXP;
 307                 break;
 308         case CMDSN_LOWER_THAN_EXP:
 309         case CMDSN_MAXCMDSN_OVERRUN:
 310         default:
 311                 cmd->i_state = ISTATE_REMOVE;
 312                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
 313                 /*
 314                  * Existing callers for iscsit_sequence_cmd() will silently
 315                  * ignore commands with CMDSN_LOWER_THAN_EXP, so force this
 316                  * return for CMDSN_MAXCMDSN_OVERRUN as well..
 317                  */
 318                 ret = CMDSN_LOWER_THAN_EXP;
 319                 break;
 320         }
 321         mutex_unlock(&conn->sess->cmdsn_mutex);
 322
 323         if (reject)
 324                 iscsit_reject_cmd(cmd, reason, buf);
 325
 326         return ret;
 327 }
 328 EXPORT_SYMBOL(iscsit_sequence_cmd);
 329
 330 int iscsit_check_unsolicited_dataout(struct iscsi_cmd *cmd, unsigned char *buf)
 331 {
 332         struct iscsi_conn *conn = cmd->conn;
 333         struct se_cmd *se_cmd = &cmd->se_cmd;
 334         struct iscsi_data *hdr = (struct iscsi_data *) buf;
 335         u32 payload_length = ntoh24(hdr->dlength);
 336
 337         if (conn->sess->sess_ops->InitialR2T) {
 338                 pr_err("Received unexpected unsolicited data"
 339                         " while InitialR2T=Yes, protocol error.\n");
 340                 transport_send_check_condition_and_sense(se_cmd,
 341                                 TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
 342                 return -1;
 343         }
 344
 345         if ((cmd->first_burst_len + payload_length) >
 346              conn->sess->sess_ops->FirstBurstLength) {
 347                 pr_err("Total %u bytes exceeds FirstBurstLength: %u"
 348                         " for this Unsolicited DataOut Burst.\n",
 349                         (cmd->first_burst_len + payload_length),
 350                                 conn->sess->sess_ops->FirstBurstLength);
 351                 transport_send_check_condition_and_sense(se_cmd,
 352                                 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
 353                 return -1;
 354         }
 355
 356         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))
 357                 return 0;
 358
 359         if (((cmd->first_burst_len + payload_length) != cmd->se_cmd.data_length) &&
 360             ((cmd->first_burst_len + payload_length) !=
 361               conn->sess->sess_ops->FirstBurstLength)) {
 362                 pr_err("Unsolicited non-immediate data received %u"
 363                         " does not equal FirstBurstLength: %u, and does"
 364                         " not equal ExpXferLen %u.\n",
 365                         (cmd->first_burst_len + payload_length),
 366                         conn->sess->sess_ops->FirstBurstLength, cmd->se_cmd.data_length);
 367                 transport_send_check_condition_and_sense(se_cmd,
 368                                 TCM_INCORRECT_AMOUNT_OF_DATA, 0);
 369                 return -1;
 370         }
 371         return 0;
 372 }
 373
 374 struct iscsi_cmd *iscsit_find_cmd_from_itt(
 375         struct iscsi_conn *conn,
 376         itt_t init_task_tag)
 377 {
 378         struct iscsi_cmd *cmd;
 379
 380         spin_lock_bh(&conn->cmd_lock);
 381         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 382                 if (cmd->init_task_tag == init_task_tag) {
 383                         spin_unlock_bh(&conn->cmd_lock);
 384                         return cmd;
 385                 }
 386         }
 387         spin_unlock_bh(&conn->cmd_lock);
 388
 389         pr_err("Unable to locate ITT: 0x%08x on CID: %hu",
 390                         init_task_tag, conn->cid);
 391         return NULL;
 392 }
 393 EXPORT_SYMBOL(iscsit_find_cmd_from_itt);
 394
 395 struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(
 396         struct iscsi_conn *conn,
 397         itt_t init_task_tag,
 398         u32 length)
 399 {
 400         struct iscsi_cmd *cmd;
 401
 402         spin_lock_bh(&conn->cmd_lock);
 403         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 404                 if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT)
 405                         continue;
 406                 if (cmd->init_task_tag == init_task_tag) {
 407                         spin_unlock_bh(&conn->cmd_lock);
 408                         return cmd;
 409                 }
 410         }
 411         spin_unlock_bh(&conn->cmd_lock);
 412
 413         pr_err("Unable to locate ITT: 0x%08x on CID: %hu,"
 414                         " dumping payload\n", init_task_tag, conn->cid);
 415         if (length)
 416                 iscsit_dump_data_payload(conn, length, 1);
 417
 418         return NULL;
 419 }
 420
 421 struct iscsi_cmd *iscsit_find_cmd_from_ttt(
 422         struct iscsi_conn *conn,
 423         u32 targ_xfer_tag)
 424 {
 425         struct iscsi_cmd *cmd = NULL;
 426
 427         spin_lock_bh(&conn->cmd_lock);
 428         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 429                 if (cmd->targ_xfer_tag == targ_xfer_tag) {
 430                         spin_unlock_bh(&conn->cmd_lock);
 431                         return cmd;
 432                 }
 433         }
 434         spin_unlock_bh(&conn->cmd_lock);
 435
 436         pr_err("Unable to locate TTT: 0x%08x on CID: %hu\n",
 437                         targ_xfer_tag, conn->cid);
 438         return NULL;
 439 }
 440
 441 int iscsit_find_cmd_for_recovery(
 442         struct iscsi_session *sess,
 443         struct iscsi_cmd **cmd_ptr,
 444         struct iscsi_conn_recovery **cr_ptr,
 445         itt_t init_task_tag)
 446 {
 447         struct iscsi_cmd *cmd = NULL;
 448         struct iscsi_conn_recovery *cr;
 449         /*
 450          * Scan through the inactive connection recovery list's command list.
 451          * If init_task_tag matches the command is still alligent.
 452          */
 453         spin_lock(&sess->cr_i_lock);
 454         list_for_each_entry(cr, &sess->cr_inactive_list, cr_list) {
 455                 spin_lock(&cr->conn_recovery_cmd_lock);
 456                 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
 457                         if (cmd->init_task_tag == init_task_tag) {
 458                                 spin_unlock(&cr->conn_recovery_cmd_lock);
 459                                 spin_unlock(&sess->cr_i_lock);
 460
 461                                 *cr_ptr = cr;
 462                                 *cmd_ptr = cmd;
 463                                 return -2;
 464                         }
 465                 }
 466                 spin_unlock(&cr->conn_recovery_cmd_lock);
 467         }
 468         spin_unlock(&sess->cr_i_lock);
 469         /*
 470          * Scan through the active connection recovery list's command list.
 471          * If init_task_tag matches the command is ready to be reassigned.
 472          */
 473         spin_lock(&sess->cr_a_lock);
 474         list_for_each_entry(cr, &sess->cr_active_list, cr_list) {
 475                 spin_lock(&cr->conn_recovery_cmd_lock);
 476                 list_for_each_entry(cmd, &cr->conn_recovery_cmd_list, i_conn_node) {
 477                         if (cmd->init_task_tag == init_task_tag) {
 478                                 spin_unlock(&cr->conn_recovery_cmd_lock);
 479                                 spin_unlock(&sess->cr_a_lock);
 480
 481                                 *cr_ptr = cr;
 482                                 *cmd_ptr = cmd;
 483                                 return 0;
 484                         }
 485                 }
 486                 spin_unlock(&cr->conn_recovery_cmd_lock);
 487         }
 488         spin_unlock(&sess->cr_a_lock);
 489
 490         return -1;
 491 }
 492
 493 void iscsit_add_cmd_to_immediate_queue(
 494         struct iscsi_cmd *cmd,
 495         struct iscsi_conn *conn,
 496         u8 state)
 497 {
 498         struct iscsi_queue_req *qr;
 499
 500         qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
 501         if (!qr) {
 502                 pr_err("Unable to allocate memory for"
 503                                 " struct iscsi_queue_req\n");
 504                 return;
 505         }
 506         INIT_LIST_HEAD(&qr->qr_list);
 507         qr->cmd = cmd;
 508         qr->state = state;
 509
 510         spin_lock_bh(&conn->immed_queue_lock);
 511         list_add_tail(&qr->qr_list, &conn->immed_queue_list);
 512         atomic_inc(&cmd->immed_queue_count);
 513         atomic_set(&conn->check_immediate_queue, 1);
 514         spin_unlock_bh(&conn->immed_queue_lock);
 515
 516         wake_up(&conn->queues_wq);
 517 }
 518
 519 struct iscsi_queue_req *iscsit_get_cmd_from_immediate_queue(struct iscsi_conn *conn)
 520 {
 521         struct iscsi_queue_req *qr;
 522
 523         spin_lock_bh(&conn->immed_queue_lock);
 524         if (list_empty(&conn->immed_queue_list)) {
 525                 spin_unlock_bh(&conn->immed_queue_lock);
 526                 return NULL;
 527         }
 528         qr = list_first_entry(&conn->immed_queue_list,
 529                               struct iscsi_queue_req, qr_list);
 530
 531         list_del(&qr->qr_list);
 532         if (qr->cmd)
 533                 atomic_dec(&qr->cmd->immed_queue_count);
 534         spin_unlock_bh(&conn->immed_queue_lock);
 535
 536         return qr;
 537 }
 538
 539 static void iscsit_remove_cmd_from_immediate_queue(
 540         struct iscsi_cmd *cmd,
 541         struct iscsi_conn *conn)
 542 {
 543         struct iscsi_queue_req *qr, *qr_tmp;
 544
 545         spin_lock_bh(&conn->immed_queue_lock);
 546         if (!atomic_read(&cmd->immed_queue_count)) {
 547                 spin_unlock_bh(&conn->immed_queue_lock);
 548                 return;
 549         }
 550
 551         list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
 552                 if (qr->cmd != cmd)
 553                         continue;
 554
 555                 atomic_dec(&qr->cmd->immed_queue_count);
 556                 list_del(&qr->qr_list);
 557                 kmem_cache_free(lio_qr_cache, qr);
 558         }
 559         spin_unlock_bh(&conn->immed_queue_lock);
 560
 561         if (atomic_read(&cmd->immed_queue_count)) {
 562                 pr_err("ITT: 0x%08x immed_queue_count: %d\n",
 563                         cmd->init_task_tag,
 564                         atomic_read(&cmd->immed_queue_count));
 565         }
 566 }
 567
 568 void iscsit_add_cmd_to_response_queue(
 569         struct iscsi_cmd *cmd,
 570         struct iscsi_conn *conn,
 571         u8 state)
 572 {
 573         struct iscsi_queue_req *qr;
 574
 575         qr = kmem_cache_zalloc(lio_qr_cache, GFP_ATOMIC);
 576         if (!qr) {
 577                 pr_err("Unable to allocate memory for"
 578                         " struct iscsi_queue_req\n");
 579                 return;
 580         }
 581         INIT_LIST_HEAD(&qr->qr_list);
 582         qr->cmd = cmd;
 583         qr->state = state;
 584
 585         spin_lock_bh(&conn->response_queue_lock);
 586         list_add_tail(&qr->qr_list, &conn->response_queue_list);
 587         atomic_inc(&cmd->response_queue_count);
 588         spin_unlock_bh(&conn->response_queue_lock);
 589
 590         wake_up(&conn->queues_wq);
 591 }
 592
 593 struct iscsi_queue_req *iscsit_get_cmd_from_response_queue(struct iscsi_conn *conn)
 594 {
 595         struct iscsi_queue_req *qr;
 596
 597         spin_lock_bh(&conn->response_queue_lock);
 598         if (list_empty(&conn->response_queue_list)) {
 599                 spin_unlock_bh(&conn->response_queue_lock);
 600                 return NULL;
 601         }
 602
 603         qr = list_first_entry(&conn->response_queue_list,
 604                               struct iscsi_queue_req, qr_list);
 605
 606         list_del(&qr->qr_list);
 607         if (qr->cmd)
 608                 atomic_dec(&qr->cmd->response_queue_count);
 609         spin_unlock_bh(&conn->response_queue_lock);
 610
 611         return qr;
 612 }
 613
 614 static void iscsit_remove_cmd_from_response_queue(
 615         struct iscsi_cmd *cmd,
 616         struct iscsi_conn *conn)
 617 {
 618         struct iscsi_queue_req *qr, *qr_tmp;
 619
 620         spin_lock_bh(&conn->response_queue_lock);
 621         if (!atomic_read(&cmd->response_queue_count)) {
 622                 spin_unlock_bh(&conn->response_queue_lock);
 623                 return;
 624         }
 625
 626         list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
 627                                 qr_list) {
 628                 if (qr->cmd != cmd)
 629                         continue;
 630
 631                 atomic_dec(&qr->cmd->response_queue_count);
 632                 list_del(&qr->qr_list);
 633                 kmem_cache_free(lio_qr_cache, qr);
 634         }
 635         spin_unlock_bh(&conn->response_queue_lock);
 636
 637         if (atomic_read(&cmd->response_queue_count)) {
 638                 pr_err("ITT: 0x%08x response_queue_count: %d\n",
 639                         cmd->init_task_tag,
 640                         atomic_read(&cmd->response_queue_count));
 641         }
 642 }
 643
 644 bool iscsit_conn_all_queues_empty(struct iscsi_conn *conn)
 645 {
 646         bool empty;
 647
 648         spin_lock_bh(&conn->immed_queue_lock);
 649         empty = list_empty(&conn->immed_queue_list);
 650         spin_unlock_bh(&conn->immed_queue_lock);
 651
 652         if (!empty)
 653                 return empty;
 654
 655         spin_lock_bh(&conn->response_queue_lock);
 656         empty = list_empty(&conn->response_queue_list);
 657         spin_unlock_bh(&conn->response_queue_lock);
 658
 659         return empty;
 660 }
 661
 662 void iscsit_free_queue_reqs_for_conn(struct iscsi_conn *conn)
 663 {
 664         struct iscsi_queue_req *qr, *qr_tmp;
 665
 666         spin_lock_bh(&conn->immed_queue_lock);
 667         list_for_each_entry_safe(qr, qr_tmp, &conn->immed_queue_list, qr_list) {
 668                 list_del(&qr->qr_list);
 669                 if (qr->cmd)
 670                         atomic_dec(&qr->cmd->immed_queue_count);
 671
 672                 kmem_cache_free(lio_qr_cache, qr);
 673         }
 674         spin_unlock_bh(&conn->immed_queue_lock);
 675
 676         spin_lock_bh(&conn->response_queue_lock);
 677         list_for_each_entry_safe(qr, qr_tmp, &conn->response_queue_list,
 678                         qr_list) {
 679                 list_del(&qr->qr_list);
 680                 if (qr->cmd)
 681                         atomic_dec(&qr->cmd->response_queue_count);
 682
 683                 kmem_cache_free(lio_qr_cache, qr);
 684         }
 685         spin_unlock_bh(&conn->response_queue_lock);
 686 }
 687
 688 void iscsit_release_cmd(struct iscsi_cmd *cmd)
 689 {
 690         struct iscsi_session *sess;
 691         struct se_cmd *se_cmd = &cmd->se_cmd;
 692
 693         if (cmd->conn)
 694                 sess = cmd->conn->sess;
 695         else
 696                 sess = cmd->sess;
 697
 698         BUG_ON(!sess || !sess->se_sess);
 699
 700         kfree(cmd->buf_ptr);
 701         kfree(cmd->pdu_list);
 702         kfree(cmd->seq_list);
 703         kfree(cmd->tmr_req);
 704         kfree(cmd->iov_data);
 705         kfree(cmd->text_in_ptr);
 706
 707         percpu_ida_free(&sess->se_sess->sess_tag_pool, se_cmd->map_tag);
 708 }
 709 EXPORT_SYMBOL(iscsit_release_cmd);
 710
 711 void __iscsit_free_cmd(struct iscsi_cmd *cmd, bool scsi_cmd,
 712                        bool check_queues)
 713 {
 714         struct iscsi_conn *conn = cmd->conn;
 715
 716         if (scsi_cmd) {
 717                 if (cmd->data_direction == DMA_TO_DEVICE) {
 718                         iscsit_stop_dataout_timer(cmd);
 719                         iscsit_free_r2ts_from_list(cmd);
 720                 }
 721                 if (cmd->data_direction == DMA_FROM_DEVICE)
 722                         iscsit_free_all_datain_reqs(cmd);
 723         }
 724
 725         if (conn && check_queues) {
 726                 iscsit_remove_cmd_from_immediate_queue(cmd, conn);
 727                 iscsit_remove_cmd_from_response_queue(cmd, conn);
 728         }
 729 }
 730
 731 void iscsit_free_cmd(struct iscsi_cmd *cmd, bool shutdown)
 732 {
 733         struct se_cmd *se_cmd = NULL;
 734         int rc;
 735         /*
 736          * Determine if a struct se_cmd is associated with
 737          * this struct iscsi_cmd.
 738          */
 739         switch (cmd->iscsi_opcode) {
 740         case ISCSI_OP_SCSI_CMD:
 741                 se_cmd = &cmd->se_cmd;
 742                 __iscsit_free_cmd(cmd, true, shutdown);
 743                 /*
 744                  * Fallthrough
 745                  */
 746         case ISCSI_OP_SCSI_TMFUNC:
 747                 rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
 748                 if (!rc && shutdown && se_cmd && se_cmd->se_sess) {
 749                         __iscsit_free_cmd(cmd, true, shutdown);
 750                         target_put_sess_cmd(se_cmd->se_sess, se_cmd);
 751                 }
 752                 break;
 753         case ISCSI_OP_REJECT:
 754                 /*
 755                  * Handle special case for REJECT when iscsi_add_reject*() has
 756                  * overwritten the original iscsi_opcode assignment, and the
 757                  * associated cmd->se_cmd needs to be released.
 758                  */
 759                 if (cmd->se_cmd.se_tfo != NULL) {
 760                         se_cmd = &cmd->se_cmd;
 761                         __iscsit_free_cmd(cmd, true, shutdown);
 762
 763                         rc = transport_generic_free_cmd(&cmd->se_cmd, shutdown);
 764                         if (!rc && shutdown && se_cmd->se_sess) {
 765                                 __iscsit_free_cmd(cmd, true, shutdown);
 766                                 target_put_sess_cmd(se_cmd->se_sess, se_cmd);
 767                         }
 768                         break;
 769                 }
 770                 /* Fall-through */
 771         default:
 772                 __iscsit_free_cmd(cmd, false, shutdown);
 773                 iscsit_release_cmd(cmd);
 774                 break;
 775         }
 776 }
 777
 778 int iscsit_check_session_usage_count(struct iscsi_session *sess)
 779 {
 780         spin_lock_bh(&sess->session_usage_lock);
 781         if (sess->session_usage_count != 0) {
 782                 sess->session_waiting_on_uc = 1;
 783                 spin_unlock_bh(&sess->session_usage_lock);
 784                 if (in_interrupt())
 785                         return 2;
 786
 787                 wait_for_completion(&sess->session_waiting_on_uc_comp);
 788                 return 1;
 789         }
 790         spin_unlock_bh(&sess->session_usage_lock);
 791
 792         return 0;
 793 }
 794
 795 void iscsit_dec_session_usage_count(struct iscsi_session *sess)
 796 {
 797         spin_lock_bh(&sess->session_usage_lock);
 798         sess->session_usage_count--;
 799
 800         if (!sess->session_usage_count && sess->session_waiting_on_uc)
 801                 complete(&sess->session_waiting_on_uc_comp);
 802
 803         spin_unlock_bh(&sess->session_usage_lock);
 804 }
 805
 806 void iscsit_inc_session_usage_count(struct iscsi_session *sess)
 807 {
 808         spin_lock_bh(&sess->session_usage_lock);
 809         sess->session_usage_count++;
 810         spin_unlock_bh(&sess->session_usage_lock);
 811 }
 812
 813 /*
 814  *      Setup conn->if_marker and conn->of_marker values based upon
 815  *      the initial marker-less interval. (see iSCSI v19 A.2)
 816  */
 817 int iscsit_set_sync_and_steering_values(struct iscsi_conn *conn)
 818 {
 819         int login_ifmarker_count = 0, login_ofmarker_count = 0, next_marker = 0;
 820         /*
 821          * IFMarkInt and OFMarkInt are negotiated as 32-bit words.
 822          */
 823         u32 IFMarkInt = (conn->conn_ops->IFMarkInt * 4);
 824         u32 OFMarkInt = (conn->conn_ops->OFMarkInt * 4);
 825
 826         if (conn->conn_ops->OFMarker) {
 827                 /*
 828                  * Account for the first Login Command received not
 829                  * via iscsi_recv_msg().
 830                  */
 831                 conn->of_marker += ISCSI_HDR_LEN;
 832                 if (conn->of_marker <= OFMarkInt) {
 833                         conn->of_marker = (OFMarkInt - conn->of_marker);
 834                 } else {
 835                         login_ofmarker_count = (conn->of_marker / OFMarkInt);
 836                         next_marker = (OFMarkInt * (login_ofmarker_count + 1)) +
 837                                         (login_ofmarker_count * MARKER_SIZE);
 838                         conn->of_marker = (next_marker - conn->of_marker);
 839                 }
 840                 conn->of_marker_offset = 0;
 841                 pr_debug("Setting OFMarker value to %u based on Initial"
 842                         " Markerless Interval.\n", conn->of_marker);
 843         }
 844
 845         if (conn->conn_ops->IFMarker) {
 846                 if (conn->if_marker <= IFMarkInt) {
 847                         conn->if_marker = (IFMarkInt - conn->if_marker);
 848                 } else {
 849                         login_ifmarker_count = (conn->if_marker / IFMarkInt);
 850                         next_marker = (IFMarkInt * (login_ifmarker_count + 1)) +
 851                                         (login_ifmarker_count * MARKER_SIZE);
 852                         conn->if_marker = (next_marker - conn->if_marker);
 853                 }
 854                 pr_debug("Setting IFMarker value to %u based on Initial"
 855                         " Markerless Interval.\n", conn->if_marker);
 856         }
 857
 858         return 0;
 859 }
 860
 861 struct iscsi_conn *iscsit_get_conn_from_cid(struct iscsi_session *sess, u16 cid)
 862 {
 863         struct iscsi_conn *conn;
 864
 865         spin_lock_bh(&sess->conn_lock);
 866         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
 867                 if ((conn->cid == cid) &&
 868                     (conn->conn_state == TARG_CONN_STATE_LOGGED_IN)) {
 869                         iscsit_inc_conn_usage_count(conn);
 870                         spin_unlock_bh(&sess->conn_lock);
 871                         return conn;
 872                 }
 873         }
 874         spin_unlock_bh(&sess->conn_lock);
 875
 876         return NULL;
 877 }
 878
 879 struct iscsi_conn *iscsit_get_conn_from_cid_rcfr(struct iscsi_session *sess, u16 cid)
 880 {
 881         struct iscsi_conn *conn;
 882
 883         spin_lock_bh(&sess->conn_lock);
 884         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
 885                 if (conn->cid == cid) {
 886                         iscsit_inc_conn_usage_count(conn);
 887                         spin_lock(&conn->state_lock);
 888                         atomic_set(&conn->connection_wait_rcfr, 1);
 889                         spin_unlock(&conn->state_lock);
 890                         spin_unlock_bh(&sess->conn_lock);
 891                         return conn;
 892                 }
 893         }
 894         spin_unlock_bh(&sess->conn_lock);
 895
 896         return NULL;
 897 }
 898
 899 void iscsit_check_conn_usage_count(struct iscsi_conn *conn)
 900 {
 901         spin_lock_bh(&conn->conn_usage_lock);
 902         if (conn->conn_usage_count != 0) {
 903                 conn->conn_waiting_on_uc = 1;
 904                 spin_unlock_bh(&conn->conn_usage_lock);
 905
 906                 wait_for_completion(&conn->conn_waiting_on_uc_comp);
 907                 return;
 908         }
 909         spin_unlock_bh(&conn->conn_usage_lock);
 910 }
 911
 912 void iscsit_dec_conn_usage_count(struct iscsi_conn *conn)
 913 {
 914         spin_lock_bh(&conn->conn_usage_lock);
 915         conn->conn_usage_count--;
 916
 917         if (!conn->conn_usage_count && conn->conn_waiting_on_uc)
 918                 complete(&conn->conn_waiting_on_uc_comp);
 919
 920         spin_unlock_bh(&conn->conn_usage_lock);
 921 }
 922
 923 void iscsit_inc_conn_usage_count(struct iscsi_conn *conn)
 924 {
 925         spin_lock_bh(&conn->conn_usage_lock);
 926         conn->conn_usage_count++;
 927         spin_unlock_bh(&conn->conn_usage_lock);
 928 }
 929
 930 static int iscsit_add_nopin(struct iscsi_conn *conn, int want_response)
 931 {
 932         u8 state;
 933         struct iscsi_cmd *cmd;
 934
 935         cmd = iscsit_allocate_cmd(conn, TASK_RUNNING);
 936         if (!cmd)
 937                 return -1;
 938
 939         cmd->iscsi_opcode = ISCSI_OP_NOOP_IN;
 940         state = (want_response) ? ISTATE_SEND_NOPIN_WANT_RESPONSE :
 941                                 ISTATE_SEND_NOPIN_NO_RESPONSE;
 942         cmd->init_task_tag = RESERVED_ITT;
 943         cmd->targ_xfer_tag = (want_response) ?
 944                              session_get_next_ttt(conn->sess) : 0xFFFFFFFF;
 945         spin_lock_bh(&conn->cmd_lock);
 946         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 947         spin_unlock_bh(&conn->cmd_lock);
 948
 949         if (want_response)
 950                 iscsit_start_nopin_response_timer(conn);
 951         iscsit_add_cmd_to_immediate_queue(cmd, conn, state);
 952
 953         return 0;
 954 }
 955
 956 static void iscsit_handle_nopin_response_timeout(unsigned long data)
 957 {
 958         struct iscsi_conn *conn = (struct iscsi_conn *) data;
 959
 960         iscsit_inc_conn_usage_count(conn);
 961
 962         spin_lock_bh(&conn->nopin_timer_lock);
 963         if (conn->nopin_response_timer_flags & ISCSI_TF_STOP) {
 964                 spin_unlock_bh(&conn->nopin_timer_lock);
 965                 iscsit_dec_conn_usage_count(conn);
 966                 return;
 967         }
 968
 969         pr_debug("Did not receive response to NOPIN on CID: %hu on"
 970                 " SID: %u, failing connection.\n", conn->cid,
 971                         conn->sess->sid);
 972         conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
 973         spin_unlock_bh(&conn->nopin_timer_lock);
 974
 975         {
 976         struct iscsi_portal_group *tpg = conn->sess->tpg;
 977         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 978
 979         if (tiqn) {
 980                 spin_lock_bh(&tiqn->sess_err_stats.lock);
 981                 strcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
 982                                 conn->sess->sess_ops->InitiatorName);
 983                 tiqn->sess_err_stats.last_sess_failure_type =
 984                                 ISCSI_SESS_ERR_CXN_TIMEOUT;
 985                 tiqn->sess_err_stats.cxn_timeout_errors++;
 986                 atomic_long_inc(&conn->sess->conn_timeout_errors);
 987                 spin_unlock_bh(&tiqn->sess_err_stats.lock);
 988         }
 989         }
 990
 991         iscsit_cause_connection_reinstatement(conn, 0);
 992         iscsit_dec_conn_usage_count(conn);
 993 }
 994
 995 void iscsit_mod_nopin_response_timer(struct iscsi_conn *conn)
 996 {
 997         struct iscsi_session *sess = conn->sess;
 998         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
 999
1000         spin_lock_bh(&conn->nopin_timer_lock);
1001         if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1002                 spin_unlock_bh(&conn->nopin_timer_lock);
1003                 return;
1004         }
1005
1006         mod_timer(&conn->nopin_response_timer,
1007                 (get_jiffies_64() + na->nopin_response_timeout * HZ));
1008         spin_unlock_bh(&conn->nopin_timer_lock);
1009 }
1010
1011 /*
1012  *      Called with conn->nopin_timer_lock held.
1013  */
1014 void iscsit_start_nopin_response_timer(struct iscsi_conn *conn)
1015 {
1016         struct iscsi_session *sess = conn->sess;
1017         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1018
1019         spin_lock_bh(&conn->nopin_timer_lock);
1020         if (conn->nopin_response_timer_flags & ISCSI_TF_RUNNING) {
1021                 spin_unlock_bh(&conn->nopin_timer_lock);
1022                 return;
1023         }
1024
1025         init_timer(&conn->nopin_response_timer);
1026         conn->nopin_response_timer.expires =
1027                 (get_jiffies_64() + na->nopin_response_timeout * HZ);
1028         conn->nopin_response_timer.data = (unsigned long)conn;
1029         conn->nopin_response_timer.function = iscsit_handle_nopin_response_timeout;
1030         conn->nopin_response_timer_flags &= ~ISCSI_TF_STOP;
1031         conn->nopin_response_timer_flags |= ISCSI_TF_RUNNING;
1032         add_timer(&conn->nopin_response_timer);
1033
1034         pr_debug("Started NOPIN Response Timer on CID: %d to %u"
1035                 " seconds\n", conn->cid, na->nopin_response_timeout);
1036         spin_unlock_bh(&conn->nopin_timer_lock);
1037 }
1038
1039 void iscsit_stop_nopin_response_timer(struct iscsi_conn *conn)
1040 {
1041         spin_lock_bh(&conn->nopin_timer_lock);
1042         if (!(conn->nopin_response_timer_flags & ISCSI_TF_RUNNING)) {
1043                 spin_unlock_bh(&conn->nopin_timer_lock);
1044                 return;
1045         }
1046         conn->nopin_response_timer_flags |= ISCSI_TF_STOP;
1047         spin_unlock_bh(&conn->nopin_timer_lock);
1048
1049         del_timer_sync(&conn->nopin_response_timer);
1050
1051         spin_lock_bh(&conn->nopin_timer_lock);
1052         conn->nopin_response_timer_flags &= ~ISCSI_TF_RUNNING;
1053         spin_unlock_bh(&conn->nopin_timer_lock);
1054 }
1055
1056 static void iscsit_handle_nopin_timeout(unsigned long data)
1057 {
1058         struct iscsi_conn *conn = (struct iscsi_conn *) data;
1059
1060         iscsit_inc_conn_usage_count(conn);
1061
1062         spin_lock_bh(&conn->nopin_timer_lock);
1063         if (conn->nopin_timer_flags & ISCSI_TF_STOP) {
1064                 spin_unlock_bh(&conn->nopin_timer_lock);
1065                 iscsit_dec_conn_usage_count(conn);
1066                 return;
1067         }
1068         conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1069         spin_unlock_bh(&conn->nopin_timer_lock);
1070
1071         iscsit_add_nopin(conn, 1);
1072         iscsit_dec_conn_usage_count(conn);
1073 }
1074
1075 /*
1076  * Called with conn->nopin_timer_lock held.
1077  */
1078 void __iscsit_start_nopin_timer(struct iscsi_conn *conn)
1079 {
1080         struct iscsi_session *sess = conn->sess;
1081         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1082         /*
1083         * NOPIN timeout is disabled.
1084          */
1085         if (!na->nopin_timeout)
1086                 return;
1087
1088         if (conn->nopin_timer_flags & ISCSI_TF_RUNNING)
1089                 return;
1090
1091         init_timer(&conn->nopin_timer);
1092         conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1093         conn->nopin_timer.data = (unsigned long)conn;
1094         conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1095         conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1096         conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1097         add_timer(&conn->nopin_timer);
1098
1099         pr_debug("Started NOPIN Timer on CID: %d at %u second"
1100                 " interval\n", conn->cid, na->nopin_timeout);
1101 }
1102
1103 void iscsit_start_nopin_timer(struct iscsi_conn *conn)
1104 {
1105         struct iscsi_session *sess = conn->sess;
1106         struct iscsi_node_attrib *na = iscsit_tpg_get_node_attrib(sess);
1107         /*
1108          * NOPIN timeout is disabled..
1109          */
1110         if (!na->nopin_timeout)
1111                 return;
1112
1113         spin_lock_bh(&conn->nopin_timer_lock);
1114         if (conn->nopin_timer_flags & ISCSI_TF_RUNNING) {
1115                 spin_unlock_bh(&conn->nopin_timer_lock);
1116                 return;
1117         }
1118
1119         init_timer(&conn->nopin_timer);
1120         conn->nopin_timer.expires = (get_jiffies_64() + na->nopin_timeout * HZ);
1121         conn->nopin_timer.data = (unsigned long)conn;
1122         conn->nopin_timer.function = iscsit_handle_nopin_timeout;
1123         conn->nopin_timer_flags &= ~ISCSI_TF_STOP;
1124         conn->nopin_timer_flags |= ISCSI_TF_RUNNING;
1125         add_timer(&conn->nopin_timer);
1126
1127         pr_debug("Started NOPIN Timer on CID: %d at %u second"
1128                         " interval\n", conn->cid, na->nopin_timeout);
1129         spin_unlock_bh(&conn->nopin_timer_lock);
1130 }
1131
1132 void iscsit_stop_nopin_timer(struct iscsi_conn *conn)
1133 {
1134         spin_lock_bh(&conn->nopin_timer_lock);
1135         if (!(conn->nopin_timer_flags & ISCSI_TF_RUNNING)) {
1136                 spin_unlock_bh(&conn->nopin_timer_lock);
1137                 return;
1138         }
1139         conn->nopin_timer_flags |= ISCSI_TF_STOP;
1140         spin_unlock_bh(&conn->nopin_timer_lock);
1141
1142         del_timer_sync(&conn->nopin_timer);
1143
1144         spin_lock_bh(&conn->nopin_timer_lock);
1145         conn->nopin_timer_flags &= ~ISCSI_TF_RUNNING;
1146         spin_unlock_bh(&conn->nopin_timer_lock);
1147 }
1148
1149 int iscsit_send_tx_data(
1150         struct iscsi_cmd *cmd,
1151         struct iscsi_conn *conn,
1152         int use_misc)
1153 {
1154         int tx_sent, tx_size;
1155         u32 iov_count;
1156         struct kvec *iov;
1157
1158 send_data:
1159         tx_size = cmd->tx_size;
1160
1161         if (!use_misc) {
1162                 iov = &cmd->iov_data[0];
1163                 iov_count = cmd->iov_data_count;
1164         } else {
1165                 iov = &cmd->iov_misc[0];
1166                 iov_count = cmd->iov_misc_count;
1167         }
1168
1169         tx_sent = tx_data(conn, &iov[0], iov_count, tx_size);
1170         if (tx_size != tx_sent) {
1171                 if (tx_sent == -EAGAIN) {
1172                         pr_err("tx_data() returned -EAGAIN\n");
1173                         goto send_data;
1174                 } else
1175                         return -1;
1176         }
1177         cmd->tx_size = 0;
1178
1179         return 0;
1180 }
1181
1182 int iscsit_fe_sendpage_sg(
1183         struct iscsi_cmd *cmd,
1184         struct iscsi_conn *conn)
1185 {
1186         struct scatterlist *sg = cmd->first_data_sg;
1187         struct kvec iov;
1188         u32 tx_hdr_size, data_len;
1189         u32 offset = cmd->first_data_sg_off;
1190         int tx_sent, iov_off;
1191
1192 send_hdr:
1193         tx_hdr_size = ISCSI_HDR_LEN;
1194         if (conn->conn_ops->HeaderDigest)
1195                 tx_hdr_size += ISCSI_CRC_LEN;
1196
1197         iov.iov_base = cmd->pdu;
1198         iov.iov_len = tx_hdr_size;
1199
1200         tx_sent = tx_data(conn, &iov, 1, tx_hdr_size);
1201         if (tx_hdr_size != tx_sent) {
1202                 if (tx_sent == -EAGAIN) {
1203                         pr_err("tx_data() returned -EAGAIN\n");
1204                         goto send_hdr;
1205                 }
1206                 return -1;
1207         }
1208
1209         data_len = cmd->tx_size - tx_hdr_size - cmd->padding;
1210         /*
1211          * Set iov_off used by padding and data digest tx_data() calls below
1212          * in order to determine proper offset into cmd->iov_data[]
1213          */
1214         if (conn->conn_ops->DataDigest) {
1215                 data_len -= ISCSI_CRC_LEN;
1216                 if (cmd->padding)
1217                         iov_off = (cmd->iov_data_count - 2);
1218                 else
1219                         iov_off = (cmd->iov_data_count - 1);
1220         } else {
1221                 iov_off = (cmd->iov_data_count - 1);
1222         }
1223         /*
1224          * Perform sendpage() for each page in the scatterlist
1225          */
1226         while (data_len) {
1227                 u32 space = (sg->length - offset);
1228                 u32 sub_len = min_t(u32, data_len, space);
1229 send_pg:
1230                 tx_sent = conn->sock->ops->sendpage(conn->sock,
1231                                         sg_page(sg), sg->offset + offset, sub_len, 0);
1232                 if (tx_sent != sub_len) {
1233                         if (tx_sent == -EAGAIN) {
1234                                 pr_err("tcp_sendpage() returned"
1235                                                 " -EAGAIN\n");
1236                                 goto send_pg;
1237                         }
1238
1239                         pr_err("tcp_sendpage() failure: %d\n",
1240                                         tx_sent);
1241                         return -1;
1242                 }
1243
1244                 data_len -= sub_len;
1245                 offset = 0;
1246                 sg = sg_next(sg);
1247         }
1248
1249 send_padding:
1250         if (cmd->padding) {
1251                 struct kvec *iov_p = &cmd->iov_data[iov_off++];
1252
1253                 tx_sent = tx_data(conn, iov_p, 1, cmd->padding);
1254                 if (cmd->padding != tx_sent) {
1255                         if (tx_sent == -EAGAIN) {
1256                                 pr_err("tx_data() returned -EAGAIN\n");
1257                                 goto send_padding;
1258                         }
1259                         return -1;
1260                 }
1261         }
1262
1263 send_datacrc:
1264         if (conn->conn_ops->DataDigest) {
1265                 struct kvec *iov_d = &cmd->iov_data[iov_off];
1266
1267                 tx_sent = tx_data(conn, iov_d, 1, ISCSI_CRC_LEN);
1268                 if (ISCSI_CRC_LEN != tx_sent) {
1269                         if (tx_sent == -EAGAIN) {
1270                                 pr_err("tx_data() returned -EAGAIN\n");
1271                                 goto send_datacrc;
1272                         }
1273                         return -1;
1274                 }
1275         }
1276
1277         return 0;
1278 }
1279
1280 /*
1281  *      This function is used for mainly sending a ISCSI_TARG_LOGIN_RSP PDU
1282  *      back to the Initiator when an expection condition occurs with the
1283  *      errors set in status_class and status_detail.
1284  *
1285  *      Parameters:     iSCSI Connection, Status Class, Status Detail.
1286  *      Returns:        0 on success, -1 on error.
1287  */
1288 int iscsit_tx_login_rsp(struct iscsi_conn *conn, u8 status_class, u8 status_detail)
1289 {
1290         struct iscsi_login_rsp *hdr;
1291         struct iscsi_login *login = conn->conn_login;
1292
1293         login->login_failed = 1;
1294         iscsit_collect_login_stats(conn, status_class, status_detail);
1295
1296         memset(&login->rsp[0], 0, ISCSI_HDR_LEN);
1297
1298         hdr     = (struct iscsi_login_rsp *)&login->rsp[0];
1299         hdr->opcode             = ISCSI_OP_LOGIN_RSP;
1300         hdr->status_class       = status_class;
1301         hdr->status_detail      = status_detail;
1302         hdr->itt                = conn->login_itt;
1303
1304         return conn->conn_transport->iscsit_put_login_tx(conn, login, 0);
1305 }
1306
1307 void iscsit_print_session_params(struct iscsi_session *sess)
1308 {
1309         struct iscsi_conn *conn;
1310
1311         pr_debug("-----------------------------[Session Params for"
1312                 " SID: %u]-----------------------------\n", sess->sid);
1313         spin_lock_bh(&sess->conn_lock);
1314         list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
1315                 iscsi_dump_conn_ops(conn->conn_ops);
1316         spin_unlock_bh(&sess->conn_lock);
1317
1318         iscsi_dump_sess_ops(sess->sess_ops);
1319 }
1320
1321 static int iscsit_do_rx_data(
1322         struct iscsi_conn *conn,
1323         struct iscsi_data_count *count)
1324 {
1325         int data = count->data_length, rx_loop = 0, total_rx = 0;
1326         struct msghdr msg;
1327
1328         if (!conn || !conn->sock || !conn->conn_ops)
1329                 return -1;
1330
1331         memset(&msg, 0, sizeof(struct msghdr));
1332         iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
1333                       count->iov, count->iov_count, data);
1334
1335         while (total_rx < data) {
1336                 rx_loop = sock_recvmsg(conn->sock, &msg,
1337                                       (data - total_rx), MSG_WAITALL);
1338                 if (rx_loop <= 0) {
1339                         pr_debug("rx_loop: %d total_rx: %d\n",
1340                                 rx_loop, total_rx);
1341                         return rx_loop;
1342                 }
1343                 total_rx += rx_loop;
1344                 pr_debug("rx_loop: %d, total_rx: %d, data: %d\n",
1345                                 rx_loop, total_rx, data);
1346         }
1347
1348         return total_rx;
1349 }
1350
1351 static int iscsit_do_tx_data(
1352         struct iscsi_conn *conn,
1353         struct iscsi_data_count *count)
1354 {
1355         int ret, iov_len;
1356         struct kvec *iov_p;
1357         struct msghdr msg;
1358
1359         if (!conn || !conn->sock || !conn->conn_ops)
1360                 return -1;
1361
1362         if (count->data_length <= 0) {
1363                 pr_err("Data length is: %d\n", count->data_length);
1364                 return -1;
1365         }
1366
1367         memset(&msg, 0, sizeof(struct msghdr));
1368
1369         iov_p = count->iov;
1370         iov_len = count->iov_count;
1371
1372         ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
1373                              count->data_length);
1374         if (ret != count->data_length) {
1375                 pr_err("Unexpected ret: %d send data %d\n",
1376                        ret, count->data_length);
1377                 return -EPIPE;
1378         }
1379         pr_debug("ret: %d, sent data: %d\n", ret, count->data_length);
1380
1381         return ret;
1382 }
1383
1384 int rx_data(
1385         struct iscsi_conn *conn,
1386         struct kvec *iov,
1387         int iov_count,
1388         int data)
1389 {
1390         struct iscsi_data_count c;
1391
1392         if (!conn || !conn->sock || !conn->conn_ops)
1393                 return -1;
1394
1395         memset(&c, 0, sizeof(struct iscsi_data_count));
1396         c.iov = iov;
1397         c.iov_count = iov_count;
1398         c.data_length = data;
1399         c.type = ISCSI_RX_DATA;
1400
1401         return iscsit_do_rx_data(conn, &c);
1402 }
1403
1404 int tx_data(
1405         struct iscsi_conn *conn,
1406         struct kvec *iov,
1407         int iov_count,
1408         int data)
1409 {
1410         struct iscsi_data_count c;
1411
1412         if (!conn || !conn->sock || !conn->conn_ops)
1413                 return -1;
1414
1415         memset(&c, 0, sizeof(struct iscsi_data_count));
1416         c.iov = iov;
1417         c.iov_count = iov_count;
1418         c.data_length = data;
1419         c.type = ISCSI_TX_DATA;
1420
1421         return iscsit_do_tx_data(conn, &c);
1422 }
1423
1424 void iscsit_collect_login_stats(
1425         struct iscsi_conn *conn,
1426         u8 status_class,
1427         u8 status_detail)
1428 {
1429         struct iscsi_param *intrname = NULL;
1430         struct iscsi_tiqn *tiqn;
1431         struct iscsi_login_stats *ls;
1432
1433         tiqn = iscsit_snmp_get_tiqn(conn);
1434         if (!tiqn)
1435                 return;
1436
1437         ls = &tiqn->login_stats;
1438
1439         spin_lock(&ls->lock);
1440         if (!strcmp(conn->login_ip, ls->last_intr_fail_ip_addr) &&
1441             ((get_jiffies_64() - ls->last_fail_time) < 10)) {
1442                 /* We already have the failure info for this login */
1443                 spin_unlock(&ls->lock);
1444                 return;
1445         }
1446
1447         if (status_class == ISCSI_STATUS_CLS_SUCCESS)
1448                 ls->accepts++;
1449         else if (status_class == ISCSI_STATUS_CLS_REDIRECT) {
1450                 ls->redirects++;
1451                 ls->last_fail_type = ISCSI_LOGIN_FAIL_REDIRECT;
1452         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR)  &&
1453                  (status_detail == ISCSI_LOGIN_STATUS_AUTH_FAILED)) {
1454                 ls->authenticate_fails++;
1455                 ls->last_fail_type =  ISCSI_LOGIN_FAIL_AUTHENTICATE;
1456         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR)  &&
1457                  (status_detail == ISCSI_LOGIN_STATUS_TGT_FORBIDDEN)) {
1458                 ls->authorize_fails++;
1459                 ls->last_fail_type = ISCSI_LOGIN_FAIL_AUTHORIZE;
1460         } else if ((status_class == ISCSI_STATUS_CLS_INITIATOR_ERR) &&
1461                  (status_detail == ISCSI_LOGIN_STATUS_INIT_ERR)) {
1462                 ls->negotiate_fails++;
1463                 ls->last_fail_type = ISCSI_LOGIN_FAIL_NEGOTIATE;
1464         } else {
1465                 ls->other_fails++;
1466                 ls->last_fail_type = ISCSI_LOGIN_FAIL_OTHER;
1467         }
1468
1469         /* Save initiator name, ip address and time, if it is a failed login */
1470         if (status_class != ISCSI_STATUS_CLS_SUCCESS) {
1471                 if (conn->param_list)
1472                         intrname = iscsi_find_param_from_key(INITIATORNAME,
1473                                                              conn->param_list);
1474                 strlcpy(ls->last_intr_fail_name,
1475                        (intrname ? intrname->value : "Unknown"),
1476                        sizeof(ls->last_intr_fail_name));
1477
1478                 ls->last_intr_fail_ip_family = conn->login_family;
1479
1480                 snprintf(ls->last_intr_fail_ip_addr, IPV6_ADDRESS_SPACE,
1481                                 "%s", conn->login_ip);
1482                 ls->last_fail_time = get_jiffies_64();
1483         }
1484
1485         spin_unlock(&ls->lock);
1486 }
1487
1488 struct iscsi_tiqn *iscsit_snmp_get_tiqn(struct iscsi_conn *conn)
1489 {
1490         struct iscsi_portal_group *tpg;
1491
1492         if (!conn || !conn->sess)
1493                 return NULL;
1494
1495         tpg = conn->sess->tpg;
1496         if (!tpg)
1497                 return NULL;
1498
1499         if (!tpg->tpg_tiqn)
1500                 return NULL;
1501
1502         return tpg->tpg_tiqn;
1503 }