SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/scsi/libiscsi.c

   1 /*
   2  * iSCSI lib functions
   3  *
   4  * Copyright (C) 2006 Red Hat, Inc.  All rights reserved.
   5  * Copyright (C) 2004 - 2006 Mike Christie
   6  * Copyright (C) 2004 - 2005 Dmitry Yusupov
   7  * Copyright (C) 2004 - 2005 Alex Aizman
   8  * maintained by open-iscsi@googlegroups.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  */
  24 #include <linux/types.h>
  25 #include <linux/mutex.h>
  26 #include <linux/kfifo.h>
  27 #include <linux/delay.h>
  28 #include <asm/unaligned.h>
  29 #include <net/tcp.h>
  30 #include <scsi/scsi_cmnd.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_eh.h>
  33 #include <scsi/scsi_tcq.h>
  34 #include <scsi/scsi_host.h>
  35 #include <scsi/scsi.h>
  36 #include <scsi/iscsi_proto.h>
  37 #include <scsi/scsi_transport.h>
  38 #include <scsi/scsi_transport_iscsi.h>
  39 #include <scsi/libiscsi.h>
  40
  41 struct iscsi_session *
  42 class_to_transport_session(struct iscsi_cls_session *cls_session)
  43 {
  44         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
  45         return iscsi_hostdata(shost->hostdata);
  46 }
  47 EXPORT_SYMBOL_GPL(class_to_transport_session);
  48
  49 #define INVALID_SN_DELTA        0xffff
  50
  51 int
  52 iscsi_check_assign_cmdsn(struct iscsi_session *session, struct iscsi_nopin *hdr)
  53 {
  54         uint32_t max_cmdsn = be32_to_cpu(hdr->max_cmdsn);
  55         uint32_t exp_cmdsn = be32_to_cpu(hdr->exp_cmdsn);
  56
  57         if (max_cmdsn < exp_cmdsn -1 &&
  58             max_cmdsn > exp_cmdsn - INVALID_SN_DELTA)
  59                 return ISCSI_ERR_MAX_CMDSN;
  60         if (max_cmdsn > session->max_cmdsn ||
  61             max_cmdsn < session->max_cmdsn - INVALID_SN_DELTA)
  62                 session->max_cmdsn = max_cmdsn;
  63         if (exp_cmdsn > session->exp_cmdsn ||
  64             exp_cmdsn < session->exp_cmdsn - INVALID_SN_DELTA)
  65                 session->exp_cmdsn = exp_cmdsn;
  66
  67         return 0;
  68 }
  69 EXPORT_SYMBOL_GPL(iscsi_check_assign_cmdsn);
  70
  71 void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
  72                                    struct iscsi_data *hdr)
  73 {
  74         struct iscsi_conn *conn = ctask->conn;
  75
  76         memset(hdr, 0, sizeof(struct iscsi_data));
  77         hdr->ttt = cpu_to_be32(ISCSI_RESERVED_TAG);
  78         hdr->datasn = cpu_to_be32(ctask->unsol_datasn);
  79         ctask->unsol_datasn++;
  80         hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
  81         memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
  82
  83         hdr->itt = ctask->hdr->itt;
  84         hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
  85         hdr->offset = cpu_to_be32(ctask->unsol_offset);
  86
  87         if (ctask->unsol_count > conn->max_xmit_dlength) {
  88                 hton24(hdr->dlength, conn->max_xmit_dlength);
  89                 ctask->data_count = conn->max_xmit_dlength;
  90                 ctask->unsol_offset += ctask->data_count;
  91                 hdr->flags = 0;
  92         } else {
  93                 hton24(hdr->dlength, ctask->unsol_count);
  94                 ctask->data_count = ctask->unsol_count;
  95                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
  96         }
  97 }
  98 EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
  99
 100 /**
 101  * iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
 102  * @ctask: iscsi cmd task
 103  *
 104  * Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
 105  * fields like dlength or final based on how much data it sends
 106  */
 107 static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
 108 {
 109         struct iscsi_conn *conn = ctask->conn;
 110         struct iscsi_session *session = conn->session;
 111         struct iscsi_cmd *hdr = ctask->hdr;
 112         struct scsi_cmnd *sc = ctask->sc;
 113
 114         hdr->opcode = ISCSI_OP_SCSI_CMD;
 115         hdr->flags = ISCSI_ATTR_SIMPLE;
 116         int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
 117         hdr->itt = build_itt(ctask->itt, conn->id, session->age);
 118         hdr->data_length = cpu_to_be32(sc->request_bufflen);
 119         hdr->cmdsn = cpu_to_be32(session->cmdsn);
 120         session->cmdsn++;
 121         hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
 122         memcpy(hdr->cdb, sc->cmnd, sc->cmd_len);
 123         if (sc->cmd_len < MAX_COMMAND_SIZE)
 124                 memset(&hdr->cdb[sc->cmd_len], 0,
 125                         MAX_COMMAND_SIZE - sc->cmd_len);
 126
 127         ctask->data_count = 0;
 128         if (sc->sc_data_direction == DMA_TO_DEVICE) {
 129                 hdr->flags |= ISCSI_FLAG_CMD_WRITE;
 130                 /*
 131                  * Write counters:
 132                  *
 133                  *      imm_count       bytes to be sent right after
 134                  *                      SCSI PDU Header
 135                  *
 136                  *      unsol_count     bytes(as Data-Out) to be sent
 137                  *                      without R2T ack right after
 138                  *                      immediate data
 139                  *
 140                  *      r2t_data_count  bytes to be sent via R2T ack's
 141                  *
 142                  *      pad_count       bytes to be sent as zero-padding
 143                  */
 144                 ctask->imm_count = 0;
 145                 ctask->unsol_count = 0;
 146                 ctask->unsol_offset = 0;
 147                 ctask->unsol_datasn = 0;
 148
 149                 if (session->imm_data_en) {
 150                         if (ctask->total_length >= session->first_burst)
 151                                 ctask->imm_count = min(session->first_burst,
 152                                                         conn->max_xmit_dlength);
 153                         else
 154                                 ctask->imm_count = min(ctask->total_length,
 155                                                         conn->max_xmit_dlength);
 156                         hton24(ctask->hdr->dlength, ctask->imm_count);
 157                 } else
 158                         zero_data(ctask->hdr->dlength);
 159
 160                 if (!session->initial_r2t_en) {
 161                         ctask->unsol_count = min(session->first_burst,
 162                                 ctask->total_length) - ctask->imm_count;
 163                         ctask->unsol_offset = ctask->imm_count;
 164                 }
 165
 166                 if (!ctask->unsol_count)
 167                         /* No unsolicit Data-Out's */
 168                         ctask->hdr->flags |= ISCSI_FLAG_CMD_FINAL;
 169         } else {
 170                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
 171                 zero_data(hdr->dlength);
 172
 173                 if (sc->sc_data_direction == DMA_FROM_DEVICE)
 174                         hdr->flags |= ISCSI_FLAG_CMD_READ;
 175         }
 176
 177         conn->scsicmd_pdus_cnt++;
 178 }
 179 EXPORT_SYMBOL_GPL(iscsi_prep_scsi_cmd_pdu);
 180
 181 /**
 182  * iscsi_complete_command - return command back to scsi-ml
 183  * @ctask: iscsi cmd task
 184  *
 185  * Must be called with session lock.
 186  * This function returns the scsi command to scsi-ml and returns
 187  * the cmd task to the pool of available cmd tasks.
 188  */
 189 static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
 190 {
 191         struct iscsi_session *session = ctask->conn->session;
 192         struct scsi_cmnd *sc = ctask->sc;
 193
 194         ctask->state = ISCSI_TASK_COMPLETED;
 195         ctask->sc = NULL;
 196         /* SCSI eh reuses commands to verify us */
 197         sc->SCp.ptr = NULL;
 198         list_del_init(&ctask->running);
 199         __kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
 200         sc->scsi_done(sc);
 201 }
 202
 203 static void __iscsi_get_ctask(struct iscsi_cmd_task *ctask)
 204 {
 205         atomic_inc(&ctask->refcount);
 206 }
 207
 208 static void iscsi_get_ctask(struct iscsi_cmd_task *ctask)
 209 {
 210         spin_lock_bh(&ctask->conn->session->lock);
 211         __iscsi_get_ctask(ctask);
 212         spin_unlock_bh(&ctask->conn->session->lock);
 213 }
 214
 215 static void __iscsi_put_ctask(struct iscsi_cmd_task *ctask)
 216 {
 217         if (atomic_dec_and_test(&ctask->refcount))
 218                 iscsi_complete_command(ctask);
 219 }
 220
 221 static void iscsi_put_ctask(struct iscsi_cmd_task *ctask)
 222 {
 223         spin_lock_bh(&ctask->conn->session->lock);
 224         __iscsi_put_ctask(ctask);
 225         spin_unlock_bh(&ctask->conn->session->lock);
 226 }
 227
 228 /**
 229  * iscsi_cmd_rsp - SCSI Command Response processing
 230  * @conn: iscsi connection
 231  * @hdr: iscsi header
 232  * @ctask: scsi command task
 233  * @data: cmd data buffer
 234  * @datalen: len of buffer
 235  *
 236  * iscsi_cmd_rsp sets up the scsi_cmnd fields based on the PDU and
 237  * then completes the command and task.
 238  **/
 239 static int iscsi_scsi_cmd_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
 240                               struct iscsi_cmd_task *ctask, char *data,
 241                               int datalen)
 242 {
 243         int rc;
 244         struct iscsi_cmd_rsp *rhdr = (struct iscsi_cmd_rsp *)hdr;
 245         struct iscsi_session *session = conn->session;
 246         struct scsi_cmnd *sc = ctask->sc;
 247
 248         rc = iscsi_check_assign_cmdsn(session, (struct iscsi_nopin*)rhdr);
 249         if (rc) {
 250                 sc->result = DID_ERROR << 16;
 251                 goto out;
 252         }
 253
 254         conn->exp_statsn = be32_to_cpu(rhdr->statsn) + 1;
 255
 256         sc->result = (DID_OK << 16) | rhdr->cmd_status;
 257
 258         if (rhdr->response != ISCSI_STATUS_CMD_COMPLETED) {
 259                 sc->result = DID_ERROR << 16;
 260                 goto out;
 261         }
 262
 263         if (rhdr->cmd_status == SAM_STAT_CHECK_CONDITION) {
 264                 uint16_t senselen;
 265
 266                 if (datalen < 2) {
 267 invalid_datalen:
 268                         printk(KERN_ERR "iscsi: Got CHECK_CONDITION but "
 269                                "invalid data buffer size of %d\n", datalen);
 270                         sc->result = DID_BAD_TARGET << 16;
 271                         goto out;
 272                 }
 273
 274                 senselen = be16_to_cpu(get_unaligned((__be16 *) data));
 275                 if (datalen < senselen)
 276                         goto invalid_datalen;
 277
 278                 memcpy(sc->sense_buffer, data + 2,
 279                        min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
 280                 debug_scsi("copied %d bytes of sense\n",
 281                            min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));
 282         }
 283
 284         if (sc->sc_data_direction == DMA_TO_DEVICE)
 285                 goto out;
 286
 287         if (rhdr->flags & ISCSI_FLAG_CMD_UNDERFLOW) {
 288                 int res_count = be32_to_cpu(rhdr->residual_count);
 289
 290                 if (res_count > 0 && res_count <= sc->request_bufflen)
 291                         sc->resid = res_count;
 292                 else
 293                         sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
 294         } else if (rhdr->flags & ISCSI_FLAG_CMD_BIDI_UNDERFLOW)
 295                 sc->result = (DID_BAD_TARGET << 16) | rhdr->cmd_status;
 296         else if (rhdr->flags & ISCSI_FLAG_CMD_OVERFLOW)
 297                 sc->resid = be32_to_cpu(rhdr->residual_count);
 298
 299 out:
 300         debug_scsi("done [sc %lx res %d itt 0x%x]\n",
 301                    (long)sc, sc->result, ctask->itt);
 302         conn->scsirsp_pdus_cnt++;
 303
 304         __iscsi_put_ctask(ctask);
 305         return rc;
 306 }
 307
 308 static void iscsi_tmf_rsp(struct iscsi_conn *conn, struct iscsi_hdr *hdr)
 309 {
 310         struct iscsi_tm_rsp *tmf = (struct iscsi_tm_rsp *)hdr;
 311
 312         conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
 313         conn->tmfrsp_pdus_cnt++;
 314
 315         if (conn->tmabort_state != TMABORT_INITIAL)
 316                 return;
 317
 318         if (tmf->response == ISCSI_TMF_RSP_COMPLETE)
 319                 conn->tmabort_state = TMABORT_SUCCESS;
 320         else if (tmf->response == ISCSI_TMF_RSP_NO_TASK)
 321                 conn->tmabort_state = TMABORT_NOT_FOUND;
 322         else
 323                 conn->tmabort_state = TMABORT_FAILED;
 324         wake_up(&conn->ehwait);
 325 }
 326
 327 static int iscsi_handle_reject(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
 328                                char *data, int datalen)
 329 {
 330         struct iscsi_reject *reject = (struct iscsi_reject *)hdr;
 331         struct iscsi_hdr rejected_pdu;
 332         uint32_t itt;
 333
 334         conn->exp_statsn = be32_to_cpu(reject->statsn) + 1;
 335
 336         if (reject->reason == ISCSI_REASON_DATA_DIGEST_ERROR) {
 337                 if (ntoh24(reject->dlength) > datalen)
 338                         return ISCSI_ERR_PROTO;
 339
 340                 if (ntoh24(reject->dlength) >= sizeof(struct iscsi_hdr)) {
 341                         memcpy(&rejected_pdu, data, sizeof(struct iscsi_hdr));
 342                         itt = get_itt(rejected_pdu.itt);
 343                         printk(KERN_ERR "itt 0x%x had pdu (op 0x%x) rejected "
 344                                 "due to DataDigest error.\n", itt,
 345                                 rejected_pdu.opcode);
 346                 }
 347         }
 348         return 0;
 349 }
 350
 351 /**
 352  * __iscsi_complete_pdu - complete pdu
 353  * @conn: iscsi conn
 354  * @hdr: iscsi header
 355  * @data: data buffer
 356  * @datalen: len of data buffer
 357  *
 358  * Completes pdu processing by freeing any resources allocated at
 359  * queuecommand or send generic. session lock must be held and verify
 360  * itt must have been called.
 361  */
 362 int __iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
 363                          char *data, int datalen)
 364 {
 365         struct iscsi_session *session = conn->session;
 366         int opcode = hdr->opcode & ISCSI_OPCODE_MASK, rc = 0;
 367         struct iscsi_cmd_task *ctask;
 368         struct iscsi_mgmt_task *mtask;
 369         uint32_t itt;
 370
 371         if (hdr->itt != RESERVED_ITT)
 372                 itt = get_itt(hdr->itt);
 373         else
 374                 itt = ~0U;
 375
 376         if (itt < session->cmds_max) {
 377                 ctask = session->cmds[itt];
 378
 379                 debug_scsi("cmdrsp [op 0x%x cid %d itt 0x%x len %d]\n",
 380                            opcode, conn->id, ctask->itt, datalen);
 381
 382                 switch(opcode) {
 383                 case ISCSI_OP_SCSI_CMD_RSP:
 384                         BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
 385                         rc = iscsi_scsi_cmd_rsp(conn, hdr, ctask, data,
 386                                                 datalen);
 387                         break;
 388                 case ISCSI_OP_SCSI_DATA_IN:
 389                         BUG_ON((void*)ctask != ctask->sc->SCp.ptr);
 390                         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
 391                                 conn->scsirsp_pdus_cnt++;
 392                                 __iscsi_put_ctask(ctask);
 393                         }
 394                         break;
 395                 case ISCSI_OP_R2T:
 396                         /* LLD handles this for now */
 397                         break;
 398                 default:
 399                         rc = ISCSI_ERR_BAD_OPCODE;
 400                         break;
 401                 }
 402         } else if (itt >= ISCSI_MGMT_ITT_OFFSET &&
 403                    itt < ISCSI_MGMT_ITT_OFFSET + session->mgmtpool_max) {
 404                 mtask = session->mgmt_cmds[itt - ISCSI_MGMT_ITT_OFFSET];
 405
 406                 debug_scsi("immrsp [op 0x%x cid %d itt 0x%x len %d]\n",
 407                            opcode, conn->id, mtask->itt, datalen);
 408
 409                 rc = iscsi_check_assign_cmdsn(session,
 410                                               (struct iscsi_nopin*)hdr);
 411                 if (rc)
 412                         goto done;
 413
 414                 switch(opcode) {
 415                 case ISCSI_OP_LOGOUT_RSP:
 416                         if (datalen) {
 417                                 rc = ISCSI_ERR_PROTO;
 418                                 break;
 419                         }
 420                         conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
 421                         /* fall through */
 422                 case ISCSI_OP_LOGIN_RSP:
 423                 case ISCSI_OP_TEXT_RSP:
 424                         /*
 425                          * login related PDU's exp_statsn is handled in
 426                          * userspace
 427                          */
 428                         if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
 429                                 rc = ISCSI_ERR_CONN_FAILED;
 430                         list_del(&mtask->running);
 431                         if (conn->login_mtask != mtask)
 432                                 __kfifo_put(session->mgmtpool.queue,
 433                                             (void*)&mtask, sizeof(void*));
 434                         break;
 435                 case ISCSI_OP_SCSI_TMFUNC_RSP:
 436                         if (datalen) {
 437                                 rc = ISCSI_ERR_PROTO;
 438                                 break;
 439                         }
 440
 441                         iscsi_tmf_rsp(conn, hdr);
 442                         break;
 443                 case ISCSI_OP_NOOP_IN:
 444                         if (hdr->ttt != cpu_to_be32(ISCSI_RESERVED_TAG) || datalen) {
 445                                 rc = ISCSI_ERR_PROTO;
 446                                 break;
 447                         }
 448                         conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
 449
 450                         if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
 451                                 rc = ISCSI_ERR_CONN_FAILED;
 452                         list_del(&mtask->running);
 453                         if (conn->login_mtask != mtask)
 454                                 __kfifo_put(session->mgmtpool.queue,
 455                                             (void*)&mtask, sizeof(void*));
 456                         break;
 457                 default:
 458                         rc = ISCSI_ERR_BAD_OPCODE;
 459                         break;
 460                 }
 461         } else if (itt == ~0U) {
 462                 rc = iscsi_check_assign_cmdsn(session,
 463                                              (struct iscsi_nopin*)hdr);
 464                 if (rc)
 465                         goto done;
 466
 467                 switch(opcode) {
 468                 case ISCSI_OP_NOOP_IN:
 469                         if (datalen) {
 470                                 rc = ISCSI_ERR_PROTO;
 471                                 break;
 472                         }
 473
 474                         if (hdr->ttt == cpu_to_be32(ISCSI_RESERVED_TAG))
 475                                 break;
 476
 477                         if (iscsi_recv_pdu(conn->cls_conn, hdr, NULL, 0))
 478                                 rc = ISCSI_ERR_CONN_FAILED;
 479                         break;
 480                 case ISCSI_OP_REJECT:
 481                         rc = iscsi_handle_reject(conn, hdr, data, datalen);
 482                         break;
 483                 case ISCSI_OP_ASYNC_EVENT:
 484                         conn->exp_statsn = be32_to_cpu(hdr->statsn) + 1;
 485                         if (iscsi_recv_pdu(conn->cls_conn, hdr, data, datalen))
 486                                 rc = ISCSI_ERR_CONN_FAILED;
 487                         break;
 488                 default:
 489                         rc = ISCSI_ERR_BAD_OPCODE;
 490                         break;
 491                 }
 492         } else
 493                 rc = ISCSI_ERR_BAD_ITT;
 494
 495 done:
 496         return rc;
 497 }
 498 EXPORT_SYMBOL_GPL(__iscsi_complete_pdu);
 499
 500 int iscsi_complete_pdu(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
 501                        char *data, int datalen)
 502 {
 503         int rc;
 504
 505         spin_lock(&conn->session->lock);
 506         rc = __iscsi_complete_pdu(conn, hdr, data, datalen);
 507         spin_unlock(&conn->session->lock);
 508         return rc;
 509 }
 510 EXPORT_SYMBOL_GPL(iscsi_complete_pdu);
 511
 512 /* verify itt (itt encoding: age+cid+itt) */
 513 int iscsi_verify_itt(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
 514                      uint32_t *ret_itt)
 515 {
 516         struct iscsi_session *session = conn->session;
 517         struct iscsi_cmd_task *ctask;
 518         uint32_t itt;
 519
 520         if (hdr->itt != RESERVED_ITT) {
 521                 if (((__force u32)hdr->itt & ISCSI_AGE_MASK) !=
 522                     (session->age << ISCSI_AGE_SHIFT)) {
 523                         printk(KERN_ERR "iscsi: received itt %x expected "
 524                                 "session age (%x)\n", (__force u32)hdr->itt,
 525                                 session->age & ISCSI_AGE_MASK);
 526                         return ISCSI_ERR_BAD_ITT;
 527                 }
 528
 529                 if (((__force u32)hdr->itt & ISCSI_CID_MASK) !=
 530                     (conn->id << ISCSI_CID_SHIFT)) {
 531                         printk(KERN_ERR "iscsi: received itt %x, expected "
 532                                 "CID (%x)\n", (__force u32)hdr->itt, conn->id);
 533                         return ISCSI_ERR_BAD_ITT;
 534                 }
 535                 itt = get_itt(hdr->itt);
 536         } else
 537                 itt = ~0U;
 538
 539         if (itt < session->cmds_max) {
 540                 ctask = session->cmds[itt];
 541
 542                 if (!ctask->sc) {
 543                         printk(KERN_INFO "iscsi: dropping ctask with "
 544                                "itt 0x%x\n", ctask->itt);
 545                         /* force drop */
 546                         return ISCSI_ERR_NO_SCSI_CMD;
 547                 }
 548
 549                 if (ctask->sc->SCp.phase != session->age) {
 550                         printk(KERN_ERR "iscsi: ctask's session age %d, "
 551                                 "expected %d\n", ctask->sc->SCp.phase,
 552                                 session->age);
 553                         return ISCSI_ERR_SESSION_FAILED;
 554                 }
 555         }
 556
 557         *ret_itt = itt;
 558         return 0;
 559 }
 560 EXPORT_SYMBOL_GPL(iscsi_verify_itt);
 561
 562 void iscsi_conn_failure(struct iscsi_conn *conn, enum iscsi_err err)
 563 {
 564         struct iscsi_session *session = conn->session;
 565         unsigned long flags;
 566
 567         spin_lock_irqsave(&session->lock, flags);
 568         if (session->state == ISCSI_STATE_FAILED) {
 569                 spin_unlock_irqrestore(&session->lock, flags);
 570                 return;
 571         }
 572
 573         if (conn->stop_stage == 0)
 574                 session->state = ISCSI_STATE_FAILED;
 575         spin_unlock_irqrestore(&session->lock, flags);
 576         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
 577         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
 578         iscsi_conn_error(conn->cls_conn, err);
 579 }
 580 EXPORT_SYMBOL_GPL(iscsi_conn_failure);
 581
 582 static int iscsi_xmit_mtask(struct iscsi_conn *conn)
 583 {
 584         struct iscsi_hdr *hdr = conn->mtask->hdr;
 585         int rc, was_logout = 0;
 586
 587         if ((hdr->opcode & ISCSI_OPCODE_MASK) == ISCSI_OP_LOGOUT) {
 588                 conn->session->state = ISCSI_STATE_IN_RECOVERY;
 589                 iscsi_block_session(session_to_cls(conn->session));
 590                 was_logout = 1;
 591         }
 592         rc = conn->session->tt->xmit_mgmt_task(conn, conn->mtask);
 593         if (rc)
 594                 return rc;
 595
 596         /* done with this in-progress mtask */
 597         conn->mtask = NULL;
 598
 599         if (was_logout) {
 600                 set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
 601                 return -ENODATA;
 602         }
 603         return 0;
 604 }
 605
 606 /**
 607  * iscsi_data_xmit - xmit any command into the scheduled connection
 608  * @conn: iscsi connection
 609  *
 610  * Notes:
 611  *      The function can return -EAGAIN in which case the caller must
 612  *      re-schedule it again later or recover. '0' return code means
 613  *      successful xmit.
 614  **/
 615 static int iscsi_data_xmit(struct iscsi_conn *conn)
 616 {
 617         struct iscsi_transport *tt;
 618         int rc = 0;
 619
 620         if (unlikely(conn->suspend_tx)) {
 621                 debug_scsi("conn %d Tx suspended!\n", conn->id);
 622                 return -ENODATA;
 623         }
 624         tt = conn->session->tt;
 625
 626         /*
 627          * Transmit in the following order:
 628          *
 629          * 1) un-finished xmit (ctask or mtask)
 630          * 2) immediate control PDUs
 631          * 3) write data
 632          * 4) SCSI commands
 633          * 5) non-immediate control PDUs
 634          *
 635          * No need to lock around __kfifo_get as long as
 636          * there's one producer and one consumer.
 637          */
 638
 639         BUG_ON(conn->ctask && conn->mtask);
 640
 641         if (conn->ctask) {
 642                 iscsi_get_ctask(conn->ctask);
 643                 rc = tt->xmit_cmd_task(conn, conn->ctask);
 644                 iscsi_put_ctask(conn->ctask);
 645                 if (rc)
 646                         goto again;
 647                 /* done with this in-progress ctask */
 648                 conn->ctask = NULL;
 649         }
 650         if (conn->mtask) {
 651                 rc = iscsi_xmit_mtask(conn);
 652                 if (rc)
 653                         goto again;
 654         }
 655
 656         /* process immediate first */
 657         if (unlikely(__kfifo_len(conn->immqueue))) {
 658                 while (__kfifo_get(conn->immqueue, (void*)&conn->mtask,
 659                                    sizeof(void*))) {
 660                         spin_lock_bh(&conn->session->lock);
 661                         list_add_tail(&conn->mtask->running,
 662                                       &conn->mgmt_run_list);
 663                         spin_unlock_bh(&conn->session->lock);
 664                         rc = iscsi_xmit_mtask(conn);
 665                         if (rc)
 666                                 goto again;
 667                 }
 668         }
 669
 670         /* process command queue */
 671         spin_lock_bh(&conn->session->lock);
 672         while (!list_empty(&conn->xmitqueue)) {
 673                 /*
 674                  * iscsi tcp may readd the task to the xmitqueue to send
 675                  * write data
 676                  */
 677                 conn->ctask = list_entry(conn->xmitqueue.next,
 678                                          struct iscsi_cmd_task, running);
 679                 conn->ctask->state = ISCSI_TASK_RUNNING;
 680                 list_move_tail(conn->xmitqueue.next, &conn->run_list);
 681                 __iscsi_get_ctask(conn->ctask);
 682                 spin_unlock_bh(&conn->session->lock);
 683
 684                 rc = tt->xmit_cmd_task(conn, conn->ctask);
 685
 686                 spin_lock_bh(&conn->session->lock);
 687                 __iscsi_put_ctask(conn->ctask);
 688                 if (rc) {
 689                         spin_unlock_bh(&conn->session->lock);
 690                         goto again;
 691                 }
 692         }
 693         spin_unlock_bh(&conn->session->lock);
 694         /* done with this ctask */
 695         conn->ctask = NULL;
 696
 697         /* process the rest control plane PDUs, if any */
 698         if (unlikely(__kfifo_len(conn->mgmtqueue))) {
 699                 while (__kfifo_get(conn->mgmtqueue, (void*)&conn->mtask,
 700                                    sizeof(void*))) {
 701                         spin_lock_bh(&conn->session->lock);
 702                         list_add_tail(&conn->mtask->running,
 703                                       &conn->mgmt_run_list);
 704                         spin_unlock_bh(&conn->session->lock);
 705                         rc = iscsi_xmit_mtask(conn);
 706                         if (rc)
 707                                 goto again;
 708                 }
 709         }
 710
 711         return -ENODATA;
 712
 713 again:
 714         if (unlikely(conn->suspend_tx))
 715                 return -ENODATA;
 716
 717         return rc;
 718 }
 719
 720 static void iscsi_xmitworker(struct work_struct *work)
 721 {
 722         struct iscsi_conn *conn =
 723                 container_of(work, struct iscsi_conn, xmitwork);
 724         int rc;
 725         /*
 726          * serialize Xmit worker on a per-connection basis.
 727          */
 728         mutex_lock(&conn->xmitmutex);
 729         do {
 730                 rc = iscsi_data_xmit(conn);
 731         } while (rc >= 0 || rc == -EAGAIN);
 732         mutex_unlock(&conn->xmitmutex);
 733 }
 734
 735 enum {
 736         FAILURE_BAD_HOST = 1,
 737         FAILURE_SESSION_FAILED,
 738         FAILURE_SESSION_FREED,
 739         FAILURE_WINDOW_CLOSED,
 740         FAILURE_OOM,
 741         FAILURE_SESSION_TERMINATE,
 742         FAILURE_SESSION_IN_RECOVERY,
 743         FAILURE_SESSION_RECOVERY_TIMEOUT,
 744 };
 745
 746 int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
 747 {
 748         struct Scsi_Host *host;
 749         int reason = 0;
 750         struct iscsi_session *session;
 751         struct iscsi_conn *conn;
 752         struct iscsi_cmd_task *ctask = NULL;
 753
 754         sc->scsi_done = done;
 755         sc->result = 0;
 756         sc->SCp.ptr = NULL;
 757
 758         host = sc->device->host;
 759         session = iscsi_hostdata(host->hostdata);
 760
 761         spin_lock(&session->lock);
 762
 763         /*
 764          * ISCSI_STATE_FAILED is a temp. state. The recovery
 765          * code will decide what is best to do with command queued
 766          * during this time
 767          */
 768         if (session->state != ISCSI_STATE_LOGGED_IN &&
 769             session->state != ISCSI_STATE_FAILED) {
 770                 /*
 771                  * to handle the race between when we set the recovery state
 772                  * and block the session we requeue here (commands could
 773                  * be entering our queuecommand while a block is starting
 774                  * up because the block code is not locked)
 775                  */
 776                 if (session->state == ISCSI_STATE_IN_RECOVERY) {
 777                         reason = FAILURE_SESSION_IN_RECOVERY;
 778                         goto reject;
 779                 }
 780
 781                 if (session->state == ISCSI_STATE_RECOVERY_FAILED)
 782                         reason = FAILURE_SESSION_RECOVERY_TIMEOUT;
 783                 else if (session->state == ISCSI_STATE_TERMINATE)
 784                         reason = FAILURE_SESSION_TERMINATE;
 785                 else
 786                         reason = FAILURE_SESSION_FREED;
 787                 goto fault;
 788         }
 789
 790         /*
 791          * Check for iSCSI window and take care of CmdSN wrap-around
 792          */
 793         if ((int)(session->max_cmdsn - session->cmdsn) < 0) {
 794                 reason = FAILURE_WINDOW_CLOSED;
 795                 goto reject;
 796         }
 797
 798         conn = session->leadconn;
 799         if (!conn) {
 800                 reason = FAILURE_SESSION_FREED;
 801                 goto fault;
 802         }
 803
 804         if (!__kfifo_get(session->cmdpool.queue, (void*)&ctask,
 805                          sizeof(void*))) {
 806                 reason = FAILURE_OOM;
 807                 goto reject;
 808         }
 809         sc->SCp.phase = session->age;
 810         sc->SCp.ptr = (char *)ctask;
 811
 812         atomic_set(&ctask->refcount, 1);
 813         ctask->state = ISCSI_TASK_PENDING;
 814         ctask->mtask = NULL;
 815         ctask->conn = conn;
 816         ctask->sc = sc;
 817         INIT_LIST_HEAD(&ctask->running);
 818         ctask->total_length = sc->request_bufflen;
 819         iscsi_prep_scsi_cmd_pdu(ctask);
 820
 821         session->tt->init_cmd_task(ctask);
 822
 823         list_add_tail(&ctask->running, &conn->xmitqueue);
 824         debug_scsi(
 825                "ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
 826                 "win %d]\n",
 827                 sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
 828                 conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
 829                 session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
 830         spin_unlock(&session->lock);
 831
 832         scsi_queue_work(host, &conn->xmitwork);
 833         return 0;
 834
 835 reject:
 836         spin_unlock(&session->lock);
 837         debug_scsi("cmd 0x%x rejected (%d)\n", sc->cmnd[0], reason);
 838         return SCSI_MLQUEUE_HOST_BUSY;
 839
 840 fault:
 841         spin_unlock(&session->lock);
 842         printk(KERN_ERR "iscsi: cmd 0x%x is not queued (%d)\n",
 843                sc->cmnd[0], reason);
 844         sc->result = (DID_NO_CONNECT << 16);
 845         sc->resid = sc->request_bufflen;
 846         sc->scsi_done(sc);
 847         return 0;
 848 }
 849 EXPORT_SYMBOL_GPL(iscsi_queuecommand);
 850
 851 int iscsi_change_queue_depth(struct scsi_device *sdev, int depth)
 852 {
 853         if (depth > ISCSI_MAX_CMD_PER_LUN)
 854                 depth = ISCSI_MAX_CMD_PER_LUN;
 855         scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
 856         return sdev->queue_depth;
 857 }
 858 EXPORT_SYMBOL_GPL(iscsi_change_queue_depth);
 859
 860 static int
 861 iscsi_conn_send_generic(struct iscsi_conn *conn, struct iscsi_hdr *hdr,
 862                         char *data, uint32_t data_size)
 863 {
 864         struct iscsi_session *session = conn->session;
 865         struct iscsi_nopout *nop = (struct iscsi_nopout *)hdr;
 866         struct iscsi_mgmt_task *mtask;
 867
 868         spin_lock_bh(&session->lock);
 869         if (session->state == ISCSI_STATE_TERMINATE) {
 870                 spin_unlock_bh(&session->lock);
 871                 return -EPERM;
 872         }
 873         if (hdr->opcode == (ISCSI_OP_LOGIN | ISCSI_OP_IMMEDIATE) ||
 874             hdr->opcode == (ISCSI_OP_TEXT | ISCSI_OP_IMMEDIATE))
 875                 /*
 876                  * Login and Text are sent serially, in
 877                  * request-followed-by-response sequence.
 878                  * Same mtask can be used. Same ITT must be used.
 879                  * Note that login_mtask is preallocated at conn_create().
 880                  */
 881                 mtask = conn->login_mtask;
 882         else {
 883                 BUG_ON(conn->c_stage == ISCSI_CONN_INITIAL_STAGE);
 884                 BUG_ON(conn->c_stage == ISCSI_CONN_STOPPED);
 885
 886                 nop->exp_statsn = cpu_to_be32(conn->exp_statsn);
 887                 if (!__kfifo_get(session->mgmtpool.queue,
 888                                  (void*)&mtask, sizeof(void*))) {
 889                         spin_unlock_bh(&session->lock);
 890                         return -ENOSPC;
 891                 }
 892         }
 893
 894         /*
 895          * pre-format CmdSN for outgoing PDU.
 896          */
 897         if (hdr->itt != RESERVED_ITT) {
 898                 hdr->itt = build_itt(mtask->itt, conn->id, session->age);
 899                 nop->cmdsn = cpu_to_be32(session->cmdsn);
 900                 if (conn->c_stage == ISCSI_CONN_STARTED &&
 901                     !(hdr->opcode & ISCSI_OP_IMMEDIATE))
 902                         session->cmdsn++;
 903         } else
 904                 /* do not advance CmdSN */
 905                 nop->cmdsn = cpu_to_be32(session->cmdsn);
 906
 907         if (data_size) {
 908                 memcpy(mtask->data, data, data_size);
 909                 mtask->data_count = data_size;
 910         } else
 911                 mtask->data_count = 0;
 912
 913         INIT_LIST_HEAD(&mtask->running);
 914         memcpy(mtask->hdr, hdr, sizeof(struct iscsi_hdr));
 915         if (session->tt->init_mgmt_task)
 916                 session->tt->init_mgmt_task(conn, mtask, data, data_size);
 917         spin_unlock_bh(&session->lock);
 918
 919         debug_scsi("mgmtpdu [op 0x%x hdr->itt 0x%x datalen %d]\n",
 920                    hdr->opcode, hdr->itt, data_size);
 921
 922         /*
 923          * since send_pdu() could be called at least from two contexts,
 924          * we need to serialize __kfifo_put, so we don't have to take
 925          * additional lock on fast data-path
 926          */
 927         if (hdr->opcode & ISCSI_OP_IMMEDIATE)
 928                 __kfifo_put(conn->immqueue, (void*)&mtask, sizeof(void*));
 929         else
 930                 __kfifo_put(conn->mgmtqueue, (void*)&mtask, sizeof(void*));
 931
 932         scsi_queue_work(session->host, &conn->xmitwork);
 933         return 0;
 934 }
 935
 936 int iscsi_conn_send_pdu(struct iscsi_cls_conn *cls_conn, struct iscsi_hdr *hdr,
 937                         char *data, uint32_t data_size)
 938 {
 939         struct iscsi_conn *conn = cls_conn->dd_data;
 940         int rc;
 941
 942         mutex_lock(&conn->xmitmutex);
 943         rc = iscsi_conn_send_generic(conn, hdr, data, data_size);
 944         mutex_unlock(&conn->xmitmutex);
 945
 946         return rc;
 947 }
 948 EXPORT_SYMBOL_GPL(iscsi_conn_send_pdu);
 949
 950 void iscsi_session_recovery_timedout(struct iscsi_cls_session *cls_session)
 951 {
 952         struct iscsi_session *session = class_to_transport_session(cls_session);
 953         struct iscsi_conn *conn = session->leadconn;
 954
 955         spin_lock_bh(&session->lock);
 956         if (session->state != ISCSI_STATE_LOGGED_IN) {
 957                 session->state = ISCSI_STATE_RECOVERY_FAILED;
 958                 if (conn)
 959                         wake_up(&conn->ehwait);
 960         }
 961         spin_unlock_bh(&session->lock);
 962 }
 963 EXPORT_SYMBOL_GPL(iscsi_session_recovery_timedout);
 964
 965 int iscsi_eh_host_reset(struct scsi_cmnd *sc)
 966 {
 967         struct Scsi_Host *host = sc->device->host;
 968         struct iscsi_session *session = iscsi_hostdata(host->hostdata);
 969         struct iscsi_conn *conn = session->leadconn;
 970         int fail_session = 0;
 971
 972         spin_lock_bh(&session->lock);
 973         if (session->state == ISCSI_STATE_TERMINATE) {
 974 failed:
 975                 debug_scsi("failing host reset: session terminated "
 976                            "[CID %d age %d]\n", conn->id, session->age);
 977                 spin_unlock_bh(&session->lock);
 978                 return FAILED;
 979         }
 980
 981         if (sc->SCp.phase == session->age) {
 982                 debug_scsi("failing connection CID %d due to SCSI host reset\n",
 983                            conn->id);
 984                 fail_session = 1;
 985         }
 986         spin_unlock_bh(&session->lock);
 987
 988         /*
 989          * we drop the lock here but the leadconn cannot be destoyed while
 990          * we are in the scsi eh
 991          */
 992         if (fail_session)
 993                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
 994
 995         debug_scsi("iscsi_eh_host_reset wait for relogin\n");
 996         wait_event_interruptible(conn->ehwait,
 997                                  session->state == ISCSI_STATE_TERMINATE ||
 998                                  session->state == ISCSI_STATE_LOGGED_IN ||
 999                                  session->state == ISCSI_STATE_RECOVERY_FAILED);
1000         if (signal_pending(current))
1001                 flush_signals(current);
1002
1003         spin_lock_bh(&session->lock);
1004         if (session->state == ISCSI_STATE_LOGGED_IN)
1005                 printk(KERN_INFO "iscsi: host reset succeeded\n");
1006         else
1007                 goto failed;
1008         spin_unlock_bh(&session->lock);
1009
1010         return SUCCESS;
1011 }
1012 EXPORT_SYMBOL_GPL(iscsi_eh_host_reset);
1013
1014 static void iscsi_tmabort_timedout(unsigned long data)
1015 {
1016         struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)data;
1017         struct iscsi_conn *conn = ctask->conn;
1018         struct iscsi_session *session = conn->session;
1019
1020         spin_lock(&session->lock);
1021         if (conn->tmabort_state == TMABORT_INITIAL) {
1022                 conn->tmabort_state = TMABORT_TIMEDOUT;
1023                 debug_scsi("tmabort timedout [sc %p itt 0x%x]\n",
1024                         ctask->sc, ctask->itt);
1025                 /* unblock eh_abort() */
1026                 wake_up(&conn->ehwait);
1027         }
1028         spin_unlock(&session->lock);
1029 }
1030
1031 /* must be called with the mutex lock */
1032 static int iscsi_exec_abort_task(struct scsi_cmnd *sc,
1033                                  struct iscsi_cmd_task *ctask)
1034 {
1035         struct iscsi_conn *conn = ctask->conn;
1036         struct iscsi_session *session = conn->session;
1037         struct iscsi_tm *hdr = &conn->tmhdr;
1038         int rc;
1039
1040         /*
1041          * ctask timed out but session is OK requests must be serialized.
1042          */
1043         memset(hdr, 0, sizeof(struct iscsi_tm));
1044         hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
1045         hdr->flags = ISCSI_TM_FUNC_ABORT_TASK;
1046         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
1047         memcpy(hdr->lun, ctask->hdr->lun, sizeof(hdr->lun));
1048         hdr->rtt = ctask->hdr->itt;
1049         hdr->refcmdsn = ctask->hdr->cmdsn;
1050
1051         rc = iscsi_conn_send_generic(conn, (struct iscsi_hdr *)hdr,
1052                                      NULL, 0);
1053         if (rc) {
1054                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1055                 debug_scsi("abort sent failure [itt 0x%x] %d\n", ctask->itt,
1056                            rc);
1057                 return rc;
1058         }
1059
1060         debug_scsi("abort sent [itt 0x%x]\n", ctask->itt);
1061
1062         spin_lock_bh(&session->lock);
1063         ctask->mtask = (struct iscsi_mgmt_task *)
1064                         session->mgmt_cmds[get_itt(hdr->itt) -
1065                                         ISCSI_MGMT_ITT_OFFSET];
1066
1067         if (conn->tmabort_state == TMABORT_INITIAL) {
1068                 conn->tmfcmd_pdus_cnt++;
1069                 conn->tmabort_timer.expires = 10*HZ + jiffies;
1070                 conn->tmabort_timer.function = iscsi_tmabort_timedout;
1071                 conn->tmabort_timer.data = (unsigned long)ctask;
1072                 add_timer(&conn->tmabort_timer);
1073                 debug_scsi("abort set timeout [itt 0x%x]\n", ctask->itt);
1074         }
1075         spin_unlock_bh(&session->lock);
1076         mutex_unlock(&conn->xmitmutex);
1077
1078         /*
1079          * block eh thread until:
1080          *
1081          * 1) abort response
1082          * 2) abort timeout
1083          * 3) session is terminated or restarted or userspace has
1084          * given up on recovery
1085          */
1086         wait_event_interruptible(conn->ehwait,
1087                                  sc->SCp.phase != session->age ||
1088                                  session->state != ISCSI_STATE_LOGGED_IN ||
1089                                  conn->tmabort_state != TMABORT_INITIAL);
1090         if (signal_pending(current))
1091                 flush_signals(current);
1092         del_timer_sync(&conn->tmabort_timer);
1093
1094         mutex_lock(&conn->xmitmutex);
1095         return 0;
1096 }
1097
1098 /*
1099  * xmit mutex and session lock must be held
1100  */
1101 static struct iscsi_mgmt_task *
1102 iscsi_remove_mgmt_task(struct kfifo *fifo, uint32_t itt)
1103 {
1104         int i, nr_tasks = __kfifo_len(fifo) / sizeof(void*);
1105         struct iscsi_mgmt_task *task;
1106
1107         debug_scsi("searching %d tasks\n", nr_tasks);
1108
1109         for (i = 0; i < nr_tasks; i++) {
1110                 __kfifo_get(fifo, (void*)&task, sizeof(void*));
1111                 debug_scsi("check task %u\n", task->itt);
1112
1113                 if (task->itt == itt) {
1114                         debug_scsi("matched task\n");
1115                         return task;
1116                 }
1117
1118                 __kfifo_put(fifo, (void*)&task, sizeof(void*));
1119         }
1120         return NULL;
1121 }
1122
1123 static int iscsi_ctask_mtask_cleanup(struct iscsi_cmd_task *ctask)
1124 {
1125         struct iscsi_conn *conn = ctask->conn;
1126         struct iscsi_session *session = conn->session;
1127
1128         if (!ctask->mtask)
1129                 return -EINVAL;
1130
1131         if (!iscsi_remove_mgmt_task(conn->immqueue, ctask->mtask->itt))
1132                 list_del(&ctask->mtask->running);
1133         __kfifo_put(session->mgmtpool.queue, (void*)&ctask->mtask,
1134                     sizeof(void*));
1135         ctask->mtask = NULL;
1136         return 0;
1137 }
1138
1139 /*
1140  * session lock and xmitmutex must be held
1141  */
1142 static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
1143                          int err)
1144 {
1145         struct scsi_cmnd *sc;
1146
1147         sc = ctask->sc;
1148         if (!sc)
1149                 return;
1150
1151         conn->session->tt->cleanup_cmd_task(conn, ctask);
1152         iscsi_ctask_mtask_cleanup(ctask);
1153
1154         sc->result = err;
1155         sc->resid = sc->request_bufflen;
1156         /* release ref from queuecommand */
1157         __iscsi_put_ctask(ctask);
1158 }
1159
1160 int iscsi_eh_abort(struct scsi_cmnd *sc)
1161 {
1162         struct iscsi_cmd_task *ctask;
1163         struct iscsi_conn *conn;
1164         struct iscsi_session *session;
1165         int rc;
1166
1167         /*
1168          * if session was ISCSI_STATE_IN_RECOVERY then we may not have
1169          * got the command.
1170          */
1171         if (!sc->SCp.ptr) {
1172                 debug_scsi("sc never reached iscsi layer or it completed.\n");
1173                 return SUCCESS;
1174         }
1175
1176         ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
1177         conn = ctask->conn;
1178         session = conn->session;
1179
1180         conn->eh_abort_cnt++;
1181         debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);
1182
1183         mutex_lock(&conn->xmitmutex);
1184         spin_lock_bh(&session->lock);
1185
1186         /*
1187          * If we are not logged in or we have started a new session
1188          * then let the host reset code handle this
1189          */
1190         if (session->state != ISCSI_STATE_LOGGED_IN ||
1191             sc->SCp.phase != session->age)
1192                 goto failed;
1193
1194         /* ctask completed before time out */
1195         if (!ctask->sc) {
1196                 spin_unlock_bh(&session->lock);
1197                 debug_scsi("sc completed while abort in progress\n");
1198                 goto success_rel_mutex;
1199         }
1200
1201         /* what should we do here ? */
1202         if (conn->ctask == ctask) {
1203                 printk(KERN_INFO "iscsi: sc %p itt 0x%x partially sent. "
1204                        "Failing abort\n", sc, ctask->itt);
1205                 goto failed;
1206         }
1207
1208         if (ctask->state == ISCSI_TASK_PENDING)
1209                 goto success_cleanup;
1210
1211         conn->tmabort_state = TMABORT_INITIAL;
1212
1213         spin_unlock_bh(&session->lock);
1214         rc = iscsi_exec_abort_task(sc, ctask);
1215         spin_lock_bh(&session->lock);
1216
1217         if (rc || sc->SCp.phase != session->age ||
1218             session->state != ISCSI_STATE_LOGGED_IN)
1219                 goto failed;
1220         iscsi_ctask_mtask_cleanup(ctask);
1221
1222         switch (conn->tmabort_state) {
1223         case TMABORT_SUCCESS:
1224                 goto success_cleanup;
1225         case TMABORT_NOT_FOUND:
1226                 if (!ctask->sc) {
1227                         /* ctask completed before tmf abort response */
1228                         spin_unlock_bh(&session->lock);
1229                         debug_scsi("sc completed while abort in progress\n");
1230                         goto success_rel_mutex;
1231                 }
1232                 /* fall through */
1233         default:
1234                 /* timedout or failed */
1235                 spin_unlock_bh(&session->lock);
1236                 iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
1237                 spin_lock_bh(&session->lock);
1238                 goto failed;
1239         }
1240
1241 success_cleanup:
1242         debug_scsi("abort success [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1243         spin_unlock_bh(&session->lock);
1244
1245         /*
1246          * clean up task if aborted. we have the xmitmutex so grab
1247          * the recv lock as a writer
1248          */
1249         write_lock_bh(conn->recv_lock);
1250         spin_lock(&session->lock);
1251         fail_command(conn, ctask, DID_ABORT << 16);
1252         spin_unlock(&session->lock);
1253         write_unlock_bh(conn->recv_lock);
1254
1255 success_rel_mutex:
1256         mutex_unlock(&conn->xmitmutex);
1257         return SUCCESS;
1258
1259 failed:
1260         spin_unlock_bh(&session->lock);
1261         mutex_unlock(&conn->xmitmutex);
1262
1263         debug_scsi("abort failed [sc %lx itt 0x%x]\n", (long)sc, ctask->itt);
1264         return FAILED;
1265 }
1266 EXPORT_SYMBOL_GPL(iscsi_eh_abort);
1267
1268 int
1269 iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
1270 {
1271         int i;
1272
1273         *items = kmalloc(max * sizeof(void*), GFP_KERNEL);
1274         if (*items == NULL)
1275                 return -ENOMEM;
1276
1277         q->max = max;
1278         q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
1279         if (q->pool == NULL) {
1280                 kfree(*items);
1281                 return -ENOMEM;
1282         }
1283
1284         q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
1285                               GFP_KERNEL, NULL);
1286         if (q->queue == ERR_PTR(-ENOMEM)) {
1287                 kfree(q->pool);
1288                 kfree(*items);
1289                 return -ENOMEM;
1290         }
1291
1292         for (i = 0; i < max; i++) {
1293                 q->pool[i] = kmalloc(item_size, GFP_KERNEL);
1294                 if (q->pool[i] == NULL) {
1295                         int j;
1296
1297                         for (j = 0; j < i; j++)
1298                                 kfree(q->pool[j]);
1299
1300                         kfifo_free(q->queue);
1301                         kfree(q->pool);
1302                         kfree(*items);
1303                         return -ENOMEM;
1304                 }
1305                 memset(q->pool[i], 0, item_size);
1306                 (*items)[i] = q->pool[i];
1307                 __kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
1308         }
1309         return 0;
1310 }
1311 EXPORT_SYMBOL_GPL(iscsi_pool_init);
1312
1313 void iscsi_pool_free(struct iscsi_queue *q, void **items)
1314 {
1315         int i;
1316
1317         for (i = 0; i < q->max; i++)
1318                 kfree(items[i]);
1319         kfree(q->pool);
1320         kfree(items);
1321 }
1322 EXPORT_SYMBOL_GPL(iscsi_pool_free);
1323
1324 /*
1325  * iSCSI Session's hostdata organization:
1326  *
1327  *    *------------------* <== hostdata_session(host->hostdata)
1328  *    | ptr to class sess|
1329  *    |------------------| <== iscsi_hostdata(host->hostdata)
1330  *    | iscsi_session    |
1331  *    *------------------*
1332  */
1333
1334 #define hostdata_privsize(_sz)  (sizeof(unsigned long) + _sz + \
1335                                  _sz % sizeof(unsigned long))
1336
1337 #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata))
1338
1339 /**
1340  * iscsi_session_setup - create iscsi cls session and host and session
1341  * @scsit: scsi transport template
1342  * @iscsit: iscsi transport template
1343  * @initial_cmdsn: initial CmdSN
1344  * @hostno: host no allocated
1345  *
1346  * This can be used by software iscsi_transports that allocate
1347  * a session per scsi host.
1348  **/
1349 struct iscsi_cls_session *
1350 iscsi_session_setup(struct iscsi_transport *iscsit,
1351                     struct scsi_transport_template *scsit,
1352                     int cmd_task_size, int mgmt_task_size,
1353                     uint32_t initial_cmdsn, uint32_t *hostno)
1354 {
1355         struct Scsi_Host *shost;
1356         struct iscsi_session *session;
1357         struct iscsi_cls_session *cls_session;
1358         int cmd_i;
1359
1360         shost = scsi_host_alloc(iscsit->host_template,
1361                                 hostdata_privsize(sizeof(*session)));
1362         if (!shost)
1363                 return NULL;
1364
1365         shost->max_id = 1;
1366         shost->max_channel = 0;
1367         shost->max_lun = iscsit->max_lun;
1368         shost->max_cmd_len = iscsit->max_cmd_len;
1369         shost->transportt = scsit;
1370         shost->transportt->create_work_queue = 1;
1371         *hostno = shost->host_no;
1372
1373         session = iscsi_hostdata(shost->hostdata);
1374         memset(session, 0, sizeof(struct iscsi_session));
1375         session->host = shost;
1376         session->state = ISCSI_STATE_FREE;
1377         session->mgmtpool_max = ISCSI_MGMT_CMDS_MAX;
1378         session->cmds_max = ISCSI_XMIT_CMDS_MAX;
1379         session->cmdsn = initial_cmdsn;
1380         session->exp_cmdsn = initial_cmdsn + 1;
1381         session->max_cmdsn = initial_cmdsn + 1;
1382         session->max_r2t = 1;
1383         session->tt = iscsit;
1384
1385         /* initialize SCSI PDU commands pool */
1386         if (iscsi_pool_init(&session->cmdpool, session->cmds_max,
1387                             (void***)&session->cmds,
1388                             cmd_task_size + sizeof(struct iscsi_cmd_task)))
1389                 goto cmdpool_alloc_fail;
1390
1391         /* pre-format cmds pool with ITT */
1392         for (cmd_i = 0; cmd_i < session->cmds_max; cmd_i++) {
1393                 struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
1394
1395                 if (cmd_task_size)
1396                         ctask->dd_data = &ctask[1];
1397                 ctask->itt = cmd_i;
1398                 INIT_LIST_HEAD(&ctask->running);
1399         }
1400
1401         spin_lock_init(&session->lock);
1402
1403         /* initialize immediate command pool */
1404         if (iscsi_pool_init(&session->mgmtpool, session->mgmtpool_max,
1405                            (void***)&session->mgmt_cmds,
1406                            mgmt_task_size + sizeof(struct iscsi_mgmt_task)))
1407                 goto mgmtpool_alloc_fail;
1408
1409
1410         /* pre-format immediate cmds pool with ITT */
1411         for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
1412                 struct iscsi_mgmt_task *mtask = session->mgmt_cmds[cmd_i];
1413
1414                 if (mgmt_task_size)
1415                         mtask->dd_data = &mtask[1];
1416                 mtask->itt = ISCSI_MGMT_ITT_OFFSET + cmd_i;
1417                 INIT_LIST_HEAD(&mtask->running);
1418         }
1419
1420         if (scsi_add_host(shost, NULL))
1421                 goto add_host_fail;
1422
1423         if (!try_module_get(iscsit->owner))
1424                 goto cls_session_fail;
1425
1426         cls_session = iscsi_create_session(shost, iscsit, 0);
1427         if (!cls_session)
1428                 goto module_put;
1429         *(unsigned long*)shost->hostdata = (unsigned long)cls_session;
1430
1431         return cls_session;
1432
1433 module_put:
1434         module_put(iscsit->owner);
1435 cls_session_fail:
1436         scsi_remove_host(shost);
1437 add_host_fail:
1438         iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1439 mgmtpool_alloc_fail:
1440         iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1441 cmdpool_alloc_fail:
1442         scsi_host_put(shost);
1443         return NULL;
1444 }
1445 EXPORT_SYMBOL_GPL(iscsi_session_setup);
1446
1447 /**
1448  * iscsi_session_teardown - destroy session, host, and cls_session
1449  * shost: scsi host
1450  *
1451  * This can be used by software iscsi_transports that allocate
1452  * a session per scsi host.
1453  **/
1454 void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
1455 {
1456         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1457         struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1458         struct module *owner = cls_session->transport->owner;
1459
1460         scsi_remove_host(shost);
1461
1462         iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
1463         iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
1464
1465         kfree(session->targetname);
1466         kfree(session->hwaddress);
1467         kfree(session->initiatorname);
1468
1469         iscsi_destroy_session(cls_session);
1470         scsi_host_put(shost);
1471         module_put(owner);
1472 }
1473 EXPORT_SYMBOL_GPL(iscsi_session_teardown);
1474
1475 /**
1476  * iscsi_conn_setup - create iscsi_cls_conn and iscsi_conn
1477  * @cls_session: iscsi_cls_session
1478  * @conn_idx: cid
1479  **/
1480 struct iscsi_cls_conn *
1481 iscsi_conn_setup(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
1482 {
1483         struct iscsi_session *session = class_to_transport_session(cls_session);
1484         struct iscsi_conn *conn;
1485         struct iscsi_cls_conn *cls_conn;
1486         char *data;
1487
1488         cls_conn = iscsi_create_conn(cls_session, conn_idx);
1489         if (!cls_conn)
1490                 return NULL;
1491         conn = cls_conn->dd_data;
1492         memset(conn, 0, sizeof(*conn));
1493
1494         conn->session = session;
1495         conn->cls_conn = cls_conn;
1496         conn->c_stage = ISCSI_CONN_INITIAL_STAGE;
1497         conn->id = conn_idx;
1498         conn->exp_statsn = 0;
1499         conn->tmabort_state = TMABORT_INITIAL;
1500         INIT_LIST_HEAD(&conn->run_list);
1501         INIT_LIST_HEAD(&conn->mgmt_run_list);
1502         INIT_LIST_HEAD(&conn->xmitqueue);
1503
1504         /* initialize general immediate & non-immediate PDU commands queue */
1505         conn->immqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1506                                         GFP_KERNEL, NULL);
1507         if (conn->immqueue == ERR_PTR(-ENOMEM))
1508                 goto immqueue_alloc_fail;
1509
1510         conn->mgmtqueue = kfifo_alloc(session->mgmtpool_max * sizeof(void*),
1511                                         GFP_KERNEL, NULL);
1512         if (conn->mgmtqueue == ERR_PTR(-ENOMEM))
1513                 goto mgmtqueue_alloc_fail;
1514
1515         INIT_WORK(&conn->xmitwork, iscsi_xmitworker);
1516
1517         /* allocate login_mtask used for the login/text sequences */
1518         spin_lock_bh(&session->lock);
1519         if (!__kfifo_get(session->mgmtpool.queue,
1520                          (void*)&conn->login_mtask,
1521                          sizeof(void*))) {
1522                 spin_unlock_bh(&session->lock);
1523                 goto login_mtask_alloc_fail;
1524         }
1525         spin_unlock_bh(&session->lock);
1526
1527         data = kmalloc(ISCSI_DEF_MAX_RECV_SEG_LEN, GFP_KERNEL);
1528         if (!data)
1529                 goto login_mtask_data_alloc_fail;
1530         conn->login_mtask->data = conn->data = data;
1531
1532         init_timer(&conn->tmabort_timer);
1533         mutex_init(&conn->xmitmutex);
1534         init_waitqueue_head(&conn->ehwait);
1535
1536         return cls_conn;
1537
1538 login_mtask_data_alloc_fail:
1539         __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1540                     sizeof(void*));
1541 login_mtask_alloc_fail:
1542         kfifo_free(conn->mgmtqueue);
1543 mgmtqueue_alloc_fail:
1544         kfifo_free(conn->immqueue);
1545 immqueue_alloc_fail:
1546         iscsi_destroy_conn(cls_conn);
1547         return NULL;
1548 }
1549 EXPORT_SYMBOL_GPL(iscsi_conn_setup);
1550
1551 /**
1552  * iscsi_conn_teardown - teardown iscsi connection
1553  * cls_conn: iscsi class connection
1554  *
1555  * TODO: we may need to make this into a two step process
1556  * like scsi-mls remove + put host
1557  */
1558 void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
1559 {
1560         struct iscsi_conn *conn = cls_conn->dd_data;
1561         struct iscsi_session *session = conn->session;
1562         unsigned long flags;
1563
1564         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1565         mutex_lock(&conn->xmitmutex);
1566
1567         spin_lock_bh(&session->lock);
1568         conn->c_stage = ISCSI_CONN_CLEANUP_WAIT;
1569         if (session->leadconn == conn) {
1570                 /*
1571                  * leading connection? then give up on recovery.
1572                  */
1573                 session->state = ISCSI_STATE_TERMINATE;
1574                 wake_up(&conn->ehwait);
1575         }
1576         spin_unlock_bh(&session->lock);
1577
1578         mutex_unlock(&conn->xmitmutex);
1579
1580         /*
1581          * Block until all in-progress commands for this connection
1582          * time out or fail.
1583          */
1584         for (;;) {
1585                 spin_lock_irqsave(session->host->host_lock, flags);
1586                 if (!session->host->host_busy) { /* OK for ERL == 0 */
1587                         spin_unlock_irqrestore(session->host->host_lock, flags);
1588                         break;
1589                 }
1590                 spin_unlock_irqrestore(session->host->host_lock, flags);
1591                 msleep_interruptible(500);
1592                 printk(KERN_INFO "iscsi: scsi conn_destroy(): host_busy %d "
1593                        "host_failed %d\n", session->host->host_busy,
1594                        session->host->host_failed);
1595                 /*
1596                  * force eh_abort() to unblock
1597                  */
1598                 wake_up(&conn->ehwait);
1599         }
1600
1601         /* flush queued up work because we free the connection below */
1602         scsi_flush_work(session->host);
1603
1604         spin_lock_bh(&session->lock);
1605         kfree(conn->data);
1606         kfree(conn->persistent_address);
1607         __kfifo_put(session->mgmtpool.queue, (void*)&conn->login_mtask,
1608                     sizeof(void*));
1609         if (session->leadconn == conn) {
1610                 session->leadconn = NULL;
1611                 /* no connections exits.. reset sequencing */
1612                 session->cmdsn = session->max_cmdsn = session->exp_cmdsn = 1;
1613         }
1614         spin_unlock_bh(&session->lock);
1615
1616         kfifo_free(conn->immqueue);
1617         kfifo_free(conn->mgmtqueue);
1618
1619         iscsi_destroy_conn(cls_conn);
1620 }
1621 EXPORT_SYMBOL_GPL(iscsi_conn_teardown);
1622
1623 int iscsi_conn_start(struct iscsi_cls_conn *cls_conn)
1624 {
1625         struct iscsi_conn *conn = cls_conn->dd_data;
1626         struct iscsi_session *session = conn->session;
1627
1628         if (!session) {
1629                 printk(KERN_ERR "iscsi: can't start unbound connection\n");
1630                 return -EPERM;
1631         }
1632
1633         if ((session->imm_data_en || !session->initial_r2t_en) &&
1634              session->first_burst > session->max_burst) {
1635                 printk("iscsi: invalid burst lengths: "
1636                        "first_burst %d max_burst %d\n",
1637                        session->first_burst, session->max_burst);
1638                 return -EINVAL;
1639         }
1640
1641         spin_lock_bh(&session->lock);
1642         conn->c_stage = ISCSI_CONN_STARTED;
1643         session->state = ISCSI_STATE_LOGGED_IN;
1644
1645         switch(conn->stop_stage) {
1646         case STOP_CONN_RECOVER:
1647                 /*
1648                  * unblock eh_abort() if it is blocked. re-try all
1649                  * commands after successful recovery
1650                  */
1651                 conn->stop_stage = 0;
1652                 conn->tmabort_state = TMABORT_INITIAL;
1653                 session->age++;
1654                 spin_unlock_bh(&session->lock);
1655
1656                 iscsi_unblock_session(session_to_cls(session));
1657                 wake_up(&conn->ehwait);
1658                 return 0;
1659         case STOP_CONN_TERM:
1660                 conn->stop_stage = 0;
1661                 break;
1662         default:
1663                 break;
1664         }
1665         spin_unlock_bh(&session->lock);
1666
1667         return 0;
1668 }
1669 EXPORT_SYMBOL_GPL(iscsi_conn_start);
1670
1671 static void
1672 flush_control_queues(struct iscsi_session *session, struct iscsi_conn *conn)
1673 {
1674         struct iscsi_mgmt_task *mtask, *tmp;
1675
1676         /* handle pending */
1677         while (__kfifo_get(conn->immqueue, (void*)&mtask, sizeof(void*)) ||
1678                __kfifo_get(conn->mgmtqueue, (void*)&mtask, sizeof(void*))) {
1679                 if (mtask == conn->login_mtask)
1680                         continue;
1681                 debug_scsi("flushing pending mgmt task itt 0x%x\n", mtask->itt);
1682                 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1683                             sizeof(void*));
1684         }
1685
1686         /* handle running */
1687         list_for_each_entry_safe(mtask, tmp, &conn->mgmt_run_list, running) {
1688                 debug_scsi("flushing running mgmt task itt 0x%x\n", mtask->itt);
1689                 list_del(&mtask->running);
1690
1691                 if (mtask == conn->login_mtask)
1692                         continue;
1693                 __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
1694                            sizeof(void*));
1695         }
1696
1697         conn->mtask = NULL;
1698 }
1699
1700 /* Fail commands. Mutex and session lock held and recv side suspended */
1701 static void fail_all_commands(struct iscsi_conn *conn)
1702 {
1703         struct iscsi_cmd_task *ctask, *tmp;
1704
1705         /* flush pending */
1706         list_for_each_entry_safe(ctask, tmp, &conn->xmitqueue, running) {
1707                 debug_scsi("failing pending sc %p itt 0x%x\n", ctask->sc,
1708                            ctask->itt);
1709                 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1710         }
1711
1712         /* fail all other running */
1713         list_for_each_entry_safe(ctask, tmp, &conn->run_list, running) {
1714                 debug_scsi("failing in progress sc %p itt 0x%x\n",
1715                            ctask->sc, ctask->itt);
1716                 fail_command(conn, ctask, DID_BUS_BUSY << 16);
1717         }
1718
1719         conn->ctask = NULL;
1720 }
1721
1722 static void iscsi_start_session_recovery(struct iscsi_session *session,
1723                                          struct iscsi_conn *conn, int flag)
1724 {
1725         int old_stop_stage;
1726
1727         spin_lock_bh(&session->lock);
1728         if (conn->stop_stage == STOP_CONN_TERM) {
1729                 spin_unlock_bh(&session->lock);
1730                 return;
1731         }
1732
1733         /*
1734          * When this is called for the in_login state, we only want to clean
1735          * up the login task and connection. We do not need to block and set
1736          * the recovery state again
1737          */
1738         if (flag == STOP_CONN_TERM)
1739                 session->state = ISCSI_STATE_TERMINATE;
1740         else if (conn->stop_stage != STOP_CONN_RECOVER)
1741                 session->state = ISCSI_STATE_IN_RECOVERY;
1742
1743         old_stop_stage = conn->stop_stage;
1744         conn->stop_stage = flag;
1745         conn->c_stage = ISCSI_CONN_STOPPED;
1746         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1747         spin_unlock_bh(&session->lock);
1748
1749         write_lock_bh(conn->recv_lock);
1750         set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1751         write_unlock_bh(conn->recv_lock);
1752
1753         mutex_lock(&conn->xmitmutex);
1754         /*
1755          * for connection level recovery we should not calculate
1756          * header digest. conn->hdr_size used for optimization
1757          * in hdr_extract() and will be re-negotiated at
1758          * set_param() time.
1759          */
1760         if (flag == STOP_CONN_RECOVER) {
1761                 conn->hdrdgst_en = 0;
1762                 conn->datadgst_en = 0;
1763                 if (session->state == ISCSI_STATE_IN_RECOVERY &&
1764                     old_stop_stage != STOP_CONN_RECOVER) {
1765                         debug_scsi("blocking session\n");
1766                         iscsi_block_session(session_to_cls(session));
1767                 }
1768         }
1769
1770         /*
1771          * flush queues.
1772          */
1773         spin_lock_bh(&session->lock);
1774         fail_all_commands(conn);
1775         flush_control_queues(session, conn);
1776         spin_unlock_bh(&session->lock);
1777
1778         mutex_unlock(&conn->xmitmutex);
1779 }
1780
1781 void iscsi_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
1782 {
1783         struct iscsi_conn *conn = cls_conn->dd_data;
1784         struct iscsi_session *session = conn->session;
1785
1786         switch (flag) {
1787         case STOP_CONN_RECOVER:
1788         case STOP_CONN_TERM:
1789                 iscsi_start_session_recovery(session, conn, flag);
1790                 break;
1791         default:
1792                 printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
1793         }
1794 }
1795 EXPORT_SYMBOL_GPL(iscsi_conn_stop);
1796
1797 int iscsi_conn_bind(struct iscsi_cls_session *cls_session,
1798                     struct iscsi_cls_conn *cls_conn, int is_leading)
1799 {
1800         struct iscsi_session *session = class_to_transport_session(cls_session);
1801         struct iscsi_conn *conn = cls_conn->dd_data;
1802
1803         spin_lock_bh(&session->lock);
1804         if (is_leading)
1805                 session->leadconn = conn;
1806         spin_unlock_bh(&session->lock);
1807
1808         /*
1809          * Unblock xmitworker(), Login Phase will pass through.
1810          */
1811         clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_rx);
1812         clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
1813         return 0;
1814 }
1815 EXPORT_SYMBOL_GPL(iscsi_conn_bind);
1816
1817
1818 int iscsi_set_param(struct iscsi_cls_conn *cls_conn,
1819                     enum iscsi_param param, char *buf, int buflen)
1820 {
1821         struct iscsi_conn *conn = cls_conn->dd_data;
1822         struct iscsi_session *session = conn->session;
1823         uint32_t value;
1824
1825         switch(param) {
1826         case ISCSI_PARAM_MAX_RECV_DLENGTH:
1827                 sscanf(buf, "%d", &conn->max_recv_dlength);
1828                 break;
1829         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1830                 sscanf(buf, "%d", &conn->max_xmit_dlength);
1831                 break;
1832         case ISCSI_PARAM_HDRDGST_EN:
1833                 sscanf(buf, "%d", &conn->hdrdgst_en);
1834                 break;
1835         case ISCSI_PARAM_DATADGST_EN:
1836                 sscanf(buf, "%d", &conn->datadgst_en);
1837                 break;
1838         case ISCSI_PARAM_INITIAL_R2T_EN:
1839                 sscanf(buf, "%d", &session->initial_r2t_en);
1840                 break;
1841         case ISCSI_PARAM_MAX_R2T:
1842                 sscanf(buf, "%d", &session->max_r2t);
1843                 break;
1844         case ISCSI_PARAM_IMM_DATA_EN:
1845                 sscanf(buf, "%d", &session->imm_data_en);
1846                 break;
1847         case ISCSI_PARAM_FIRST_BURST:
1848                 sscanf(buf, "%d", &session->first_burst);
1849                 break;
1850         case ISCSI_PARAM_MAX_BURST:
1851                 sscanf(buf, "%d", &session->max_burst);
1852                 break;
1853         case ISCSI_PARAM_PDU_INORDER_EN:
1854                 sscanf(buf, "%d", &session->pdu_inorder_en);
1855                 break;
1856         case ISCSI_PARAM_DATASEQ_INORDER_EN:
1857                 sscanf(buf, "%d", &session->dataseq_inorder_en);
1858                 break;
1859         case ISCSI_PARAM_ERL:
1860                 sscanf(buf, "%d", &session->erl);
1861                 break;
1862         case ISCSI_PARAM_IFMARKER_EN:
1863                 sscanf(buf, "%d", &value);
1864                 BUG_ON(value);
1865                 break;
1866         case ISCSI_PARAM_OFMARKER_EN:
1867                 sscanf(buf, "%d", &value);
1868                 BUG_ON(value);
1869                 break;
1870         case ISCSI_PARAM_EXP_STATSN:
1871                 sscanf(buf, "%u", &conn->exp_statsn);
1872                 break;
1873         case ISCSI_PARAM_TARGET_NAME:
1874                 /* this should not change between logins */
1875                 if (session->targetname)
1876                         break;
1877
1878                 session->targetname = kstrdup(buf, GFP_KERNEL);
1879                 if (!session->targetname)
1880                         return -ENOMEM;
1881                 break;
1882         case ISCSI_PARAM_TPGT:
1883                 sscanf(buf, "%d", &session->tpgt);
1884                 break;
1885         case ISCSI_PARAM_PERSISTENT_PORT:
1886                 sscanf(buf, "%d", &conn->persistent_port);
1887                 break;
1888         case ISCSI_PARAM_PERSISTENT_ADDRESS:
1889                 /*
1890                  * this is the address returned in discovery so it should
1891                  * not change between logins.
1892                  */
1893                 if (conn->persistent_address)
1894                         break;
1895
1896                 conn->persistent_address = kstrdup(buf, GFP_KERNEL);
1897                 if (!conn->persistent_address)
1898                         return -ENOMEM;
1899                 break;
1900         default:
1901                 return -ENOSYS;
1902         }
1903
1904         return 0;
1905 }
1906 EXPORT_SYMBOL_GPL(iscsi_set_param);
1907
1908 int iscsi_session_get_param(struct iscsi_cls_session *cls_session,
1909                             enum iscsi_param param, char *buf)
1910 {
1911         struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
1912         struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
1913         int len;
1914
1915         switch(param) {
1916         case ISCSI_PARAM_INITIAL_R2T_EN:
1917                 len = sprintf(buf, "%d\n", session->initial_r2t_en);
1918                 break;
1919         case ISCSI_PARAM_MAX_R2T:
1920                 len = sprintf(buf, "%hu\n", session->max_r2t);
1921                 break;
1922         case ISCSI_PARAM_IMM_DATA_EN:
1923                 len = sprintf(buf, "%d\n", session->imm_data_en);
1924                 break;
1925         case ISCSI_PARAM_FIRST_BURST:
1926                 len = sprintf(buf, "%u\n", session->first_burst);
1927                 break;
1928         case ISCSI_PARAM_MAX_BURST:
1929                 len = sprintf(buf, "%u\n", session->max_burst);
1930                 break;
1931         case ISCSI_PARAM_PDU_INORDER_EN:
1932                 len = sprintf(buf, "%d\n", session->pdu_inorder_en);
1933                 break;
1934         case ISCSI_PARAM_DATASEQ_INORDER_EN:
1935                 len = sprintf(buf, "%d\n", session->dataseq_inorder_en);
1936                 break;
1937         case ISCSI_PARAM_ERL:
1938                 len = sprintf(buf, "%d\n", session->erl);
1939                 break;
1940         case ISCSI_PARAM_TARGET_NAME:
1941                 len = sprintf(buf, "%s\n", session->targetname);
1942                 break;
1943         case ISCSI_PARAM_TPGT:
1944                 len = sprintf(buf, "%d\n", session->tpgt);
1945                 break;
1946         default:
1947                 return -ENOSYS;
1948         }
1949
1950         return len;
1951 }
1952 EXPORT_SYMBOL_GPL(iscsi_session_get_param);
1953
1954 int iscsi_conn_get_param(struct iscsi_cls_conn *cls_conn,
1955                          enum iscsi_param param, char *buf)
1956 {
1957         struct iscsi_conn *conn = cls_conn->dd_data;
1958         int len;
1959
1960         switch(param) {
1961         case ISCSI_PARAM_MAX_RECV_DLENGTH:
1962                 len = sprintf(buf, "%u\n", conn->max_recv_dlength);
1963                 break;
1964         case ISCSI_PARAM_MAX_XMIT_DLENGTH:
1965                 len = sprintf(buf, "%u\n", conn->max_xmit_dlength);
1966                 break;
1967         case ISCSI_PARAM_HDRDGST_EN:
1968                 len = sprintf(buf, "%d\n", conn->hdrdgst_en);
1969                 break;
1970         case ISCSI_PARAM_DATADGST_EN:
1971                 len = sprintf(buf, "%d\n", conn->datadgst_en);
1972                 break;
1973         case ISCSI_PARAM_IFMARKER_EN:
1974                 len = sprintf(buf, "%d\n", conn->ifmarker_en);
1975                 break;
1976         case ISCSI_PARAM_OFMARKER_EN:
1977                 len = sprintf(buf, "%d\n", conn->ofmarker_en);
1978                 break;
1979         case ISCSI_PARAM_EXP_STATSN:
1980                 len = sprintf(buf, "%u\n", conn->exp_statsn);
1981                 break;
1982         case ISCSI_PARAM_PERSISTENT_PORT:
1983                 len = sprintf(buf, "%d\n", conn->persistent_port);
1984                 break;
1985         case ISCSI_PARAM_PERSISTENT_ADDRESS:
1986                 len = sprintf(buf, "%s\n", conn->persistent_address);
1987                 break;
1988         default:
1989                 return -ENOSYS;
1990         }
1991
1992         return len;
1993 }
1994 EXPORT_SYMBOL_GPL(iscsi_conn_get_param);
1995
1996 int iscsi_host_get_param(struct Scsi_Host *shost, enum iscsi_host_param param,
1997                          char *buf)
1998 {
1999         struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2000         int len;
2001
2002         switch (param) {
2003         case ISCSI_HOST_PARAM_HWADDRESS:
2004                 if (!session->hwaddress)
2005                         len = sprintf(buf, "%s\n", "default");
2006                 else
2007                         len = sprintf(buf, "%s\n", session->hwaddress);
2008                 break;
2009         case ISCSI_HOST_PARAM_INITIATOR_NAME:
2010                 if (!session->initiatorname)
2011                         len = sprintf(buf, "%s\n", "unknown");
2012                 else
2013                         len = sprintf(buf, "%s\n", session->initiatorname);
2014                 break;
2015
2016         default:
2017                 return -ENOSYS;
2018         }
2019
2020         return len;
2021 }
2022 EXPORT_SYMBOL_GPL(iscsi_host_get_param);
2023
2024 int iscsi_host_set_param(struct Scsi_Host *shost, enum iscsi_host_param param,
2025                          char *buf, int buflen)
2026 {
2027         struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
2028
2029         switch (param) {
2030         case ISCSI_HOST_PARAM_HWADDRESS:
2031                 if (!session->hwaddress)
2032                         session->hwaddress = kstrdup(buf, GFP_KERNEL);
2033                 break;
2034         case ISCSI_HOST_PARAM_INITIATOR_NAME:
2035                 if (!session->initiatorname)
2036                         session->initiatorname = kstrdup(buf, GFP_KERNEL);
2037                 break;
2038         default:
2039                 return -ENOSYS;
2040         }
2041
2042         return 0;
2043 }
2044 EXPORT_SYMBOL_GPL(iscsi_host_set_param);
2045
2046 MODULE_AUTHOR("Mike Christie");
2047 MODULE_DESCRIPTION("iSCSI library functions");
2048 MODULE_LICENSE("GPL");