drivers/scsi/qla4xxx/ql4_os.c

   1 /*
   2  * QLogic iSCSI HBA Driver
   3  * Copyright (c)  2003-2006 QLogic Corporation
   4  *
   5  * See LICENSE.qla4xxx for copyright and licensing details.
   6  */
   7 #include <linux/moduleparam.h>
   8
   9 #include <scsi/scsi_tcq.h>
  10 #include <scsi/scsicam.h>
  11
  12 #include "ql4_def.h"
  13 #include "ql4_version.h"
  14 #include "ql4_glbl.h"
  15 #include "ql4_dbg.h"
  16 #include "ql4_inline.h"
  17
  18 /*
  19  * Driver version
  20  */
  21 static char qla4xxx_version_str[40];
  22
  23 /*
  24  * SRB allocation cache
  25  */
  26 static struct kmem_cache *srb_cachep;
  27
  28 /*
  29  * Module parameter information and variables
  30  */
  31 int ql4xdiscoverywait = 60;
  32 module_param(ql4xdiscoverywait, int, S_IRUGO | S_IRUSR);
  33 MODULE_PARM_DESC(ql4xdiscoverywait, "Discovery wait time");
  34 int ql4xdontresethba = 0;
  35 module_param(ql4xdontresethba, int, S_IRUGO | S_IRUSR);
  36 MODULE_PARM_DESC(ql4xdontresethba,
  37                  "Dont reset the HBA when the driver gets 0x8002 AEN "
  38                  " default it will reset hba :0"
  39                  " set to 1 to avoid resetting HBA");
  40
  41 int ql4xextended_error_logging = 0; /* 0 = off, 1 = log errors */
  42 module_param(ql4xextended_error_logging, int, S_IRUGO | S_IRUSR);
  43 MODULE_PARM_DESC(ql4xextended_error_logging,
  44                  "Option to enable extended error logging, "
  45                  "Default is 0 - no logging, 1 - debug logging");
  46
  47 int ql4_mod_unload = 0;
  48
  49 #define QL4_DEF_QDEPTH 32
  50
  51 /*
  52  * SCSI host template entry points
  53  */
  54 static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha);
  55
  56 /*
  57  * iSCSI template entry points
  58  */
  59 static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
  60                              enum iscsi_tgt_dscvr type, uint32_t enable,
  61                              struct sockaddr *dst_addr);
  62 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
  63                                   enum iscsi_param param, char *buf);
  64 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
  65                                   enum iscsi_param param, char *buf);
  66 static int qla4xxx_host_get_param(struct Scsi_Host *shost,
  67                                   enum iscsi_host_param param, char *buf);
  68 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session);
  69 static enum blk_eh_timer_return qla4xxx_eh_cmd_timed_out(struct scsi_cmnd *sc);
  70
  71 /*
  72  * SCSI host template entry points
  73  */
  74 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
  75                                 void (*done) (struct scsi_cmnd *));
  76 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd);
  77 static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd);
  78 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd);
  79 static int qla4xxx_slave_alloc(struct scsi_device *device);
  80 static int qla4xxx_slave_configure(struct scsi_device *device);
  81 static void qla4xxx_slave_destroy(struct scsi_device *sdev);
  82 static void qla4xxx_scan_start(struct Scsi_Host *shost);
  83
  84 static struct scsi_host_template qla4xxx_driver_template = {
  85         .module                 = THIS_MODULE,
  86         .name                   = DRIVER_NAME,
  87         .proc_name              = DRIVER_NAME,
  88         .queuecommand           = qla4xxx_queuecommand,
  89
  90         .eh_device_reset_handler = qla4xxx_eh_device_reset,
  91         .eh_target_reset_handler = qla4xxx_eh_target_reset,
  92         .eh_host_reset_handler  = qla4xxx_eh_host_reset,
  93         .eh_timed_out           = qla4xxx_eh_cmd_timed_out,
  94
  95         .slave_configure        = qla4xxx_slave_configure,
  96         .slave_alloc            = qla4xxx_slave_alloc,
  97         .slave_destroy          = qla4xxx_slave_destroy,
  98
  99         .scan_finished          = iscsi_scan_finished,
 100         .scan_start             = qla4xxx_scan_start,
 101
 102         .this_id                = -1,
 103         .cmd_per_lun            = 3,
 104         .use_clustering         = ENABLE_CLUSTERING,
 105         .sg_tablesize           = SG_ALL,
 106
 107         .max_sectors            = 0xFFFF,
 108 };
 109
 110 static struct iscsi_transport qla4xxx_iscsi_transport = {
 111         .owner                  = THIS_MODULE,
 112         .name                   = DRIVER_NAME,
 113         .caps                   = CAP_FW_DB | CAP_SENDTARGETS_OFFLOAD |
 114                                   CAP_DATA_PATH_OFFLOAD,
 115         .param_mask             = ISCSI_CONN_PORT | ISCSI_CONN_ADDRESS |
 116                                   ISCSI_TARGET_NAME | ISCSI_TPGT,
 117         .host_param_mask        = ISCSI_HOST_HWADDRESS |
 118                                   ISCSI_HOST_IPADDRESS |
 119                                   ISCSI_HOST_INITIATOR_NAME,
 120         .tgt_dscvr              = qla4xxx_tgt_dscvr,
 121         .get_conn_param         = qla4xxx_conn_get_param,
 122         .get_session_param      = qla4xxx_sess_get_param,
 123         .get_host_param         = qla4xxx_host_get_param,
 124         .session_recovery_timedout = qla4xxx_recovery_timedout,
 125 };
 126
 127 static struct scsi_transport_template *qla4xxx_scsi_transport;
 128
 129 static enum blk_eh_timer_return qla4xxx_eh_cmd_timed_out(struct scsi_cmnd *sc)
 130 {
 131         struct iscsi_cls_session *session;
 132         struct ddb_entry *ddb_entry;
 133
 134         session = starget_to_session(scsi_target(sc->device));
 135         ddb_entry = session->dd_data;
 136
 137         /* if we are not logged in then the LLD is going to clean up the cmd */
 138         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
 139                 return BLK_EH_RESET_TIMER;
 140         else
 141                 return BLK_EH_NOT_HANDLED;
 142 }
 143
 144 static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session)
 145 {
 146         struct ddb_entry *ddb_entry = session->dd_data;
 147         struct scsi_qla_host *ha = ddb_entry->ha;
 148
 149         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 150                 atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
 151
 152                 DEBUG2(printk("scsi%ld: %s: index [%d] port down retry count "
 153                               "of (%d) secs exhausted, marking device DEAD.\n",
 154                               ha->host_no, __func__, ddb_entry->fw_ddb_index,
 155                               ha->port_down_retry_count));
 156
 157                 DEBUG2(printk("scsi%ld: %s: scheduling dpc routine - dpc "
 158                               "flags = 0x%lx\n",
 159                               ha->host_no, __func__, ha->dpc_flags));
 160                 queue_work(ha->dpc_thread, &ha->dpc_work);
 161         }
 162 }
 163
 164 static int qla4xxx_host_get_param(struct Scsi_Host *shost,
 165                                   enum iscsi_host_param param, char *buf)
 166 {
 167         struct scsi_qla_host *ha = to_qla_host(shost);
 168         int len;
 169
 170         switch (param) {
 171         case ISCSI_HOST_PARAM_HWADDRESS:
 172                 len = sysfs_format_mac(buf, ha->my_mac, MAC_ADDR_LEN);
 173                 break;
 174         case ISCSI_HOST_PARAM_IPADDRESS:
 175                 len = sprintf(buf, "%d.%d.%d.%d\n", ha->ip_address[0],
 176                               ha->ip_address[1], ha->ip_address[2],
 177                               ha->ip_address[3]);
 178                 break;
 179         case ISCSI_HOST_PARAM_INITIATOR_NAME:
 180                 len = sprintf(buf, "%s\n", ha->name_string);
 181                 break;
 182         default:
 183                 return -ENOSYS;
 184         }
 185
 186         return len;
 187 }
 188
 189 static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
 190                                   enum iscsi_param param, char *buf)
 191 {
 192         struct ddb_entry *ddb_entry = sess->dd_data;
 193         int len;
 194
 195         switch (param) {
 196         case ISCSI_PARAM_TARGET_NAME:
 197                 len = snprintf(buf, PAGE_SIZE - 1, "%s\n",
 198                                ddb_entry->iscsi_name);
 199                 break;
 200         case ISCSI_PARAM_TPGT:
 201                 len = sprintf(buf, "%u\n", ddb_entry->tpgt);
 202                 break;
 203         default:
 204                 return -ENOSYS;
 205         }
 206
 207         return len;
 208 }
 209
 210 static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
 211                                   enum iscsi_param param, char *buf)
 212 {
 213         struct iscsi_cls_session *session;
 214         struct ddb_entry *ddb_entry;
 215         int len;
 216
 217         session = iscsi_dev_to_session(conn->dev.parent);
 218         ddb_entry = session->dd_data;
 219
 220         switch (param) {
 221         case ISCSI_PARAM_CONN_PORT:
 222                 len = sprintf(buf, "%hu\n", ddb_entry->port);
 223                 break;
 224         case ISCSI_PARAM_CONN_ADDRESS:
 225                 /* TODO: what are the ipv6 bits */
 226                 len = sprintf(buf, "%pI4\n", &ddb_entry->ip_addr);
 227                 break;
 228         default:
 229                 return -ENOSYS;
 230         }
 231
 232         return len;
 233 }
 234
 235 static int qla4xxx_tgt_dscvr(struct Scsi_Host *shost,
 236                              enum iscsi_tgt_dscvr type, uint32_t enable,
 237                              struct sockaddr *dst_addr)
 238 {
 239         struct scsi_qla_host *ha;
 240         struct sockaddr_in *addr;
 241         struct sockaddr_in6 *addr6;
 242         int ret = 0;
 243
 244         ha = (struct scsi_qla_host *) shost->hostdata;
 245
 246         switch (type) {
 247         case ISCSI_TGT_DSCVR_SEND_TARGETS:
 248                 if (dst_addr->sa_family == AF_INET) {
 249                         addr = (struct sockaddr_in *)dst_addr;
 250                         if (qla4xxx_send_tgts(ha, (char *)&addr->sin_addr,
 251                                               addr->sin_port) != QLA_SUCCESS)
 252                                 ret = -EIO;
 253                 } else if (dst_addr->sa_family == AF_INET6) {
 254                         /*
 255                          * TODO: fix qla4xxx_send_tgts
 256                          */
 257                         addr6 = (struct sockaddr_in6 *)dst_addr;
 258                         if (qla4xxx_send_tgts(ha, (char *)&addr6->sin6_addr,
 259                                               addr6->sin6_port) != QLA_SUCCESS)
 260                                 ret = -EIO;
 261                 } else
 262                         ret = -ENOSYS;
 263                 break;
 264         default:
 265                 ret = -ENOSYS;
 266         }
 267         return ret;
 268 }
 269
 270 void qla4xxx_destroy_sess(struct ddb_entry *ddb_entry)
 271 {
 272         if (!ddb_entry->sess)
 273                 return;
 274
 275         if (ddb_entry->conn) {
 276                 atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
 277                 iscsi_remove_session(ddb_entry->sess);
 278         }
 279         iscsi_free_session(ddb_entry->sess);
 280 }
 281
 282 int qla4xxx_add_sess(struct ddb_entry *ddb_entry)
 283 {
 284         int err;
 285
 286         ddb_entry->sess->recovery_tmo = ddb_entry->ha->port_down_retry_count;
 287         err = iscsi_add_session(ddb_entry->sess, ddb_entry->fw_ddb_index);
 288         if (err) {
 289                 DEBUG2(printk(KERN_ERR "Could not add session.\n"));
 290                 return err;
 291         }
 292
 293         ddb_entry->conn = iscsi_create_conn(ddb_entry->sess, 0, 0);
 294         if (!ddb_entry->conn) {
 295                 iscsi_remove_session(ddb_entry->sess);
 296                 DEBUG2(printk(KERN_ERR "Could not add connection.\n"));
 297                 return -ENOMEM;
 298         }
 299
 300         /* finally ready to go */
 301         iscsi_unblock_session(ddb_entry->sess);
 302         return 0;
 303 }
 304
 305 struct ddb_entry *qla4xxx_alloc_sess(struct scsi_qla_host *ha)
 306 {
 307         struct ddb_entry *ddb_entry;
 308         struct iscsi_cls_session *sess;
 309
 310         sess = iscsi_alloc_session(ha->host, &qla4xxx_iscsi_transport,
 311                                    sizeof(struct ddb_entry));
 312         if (!sess)
 313                 return NULL;
 314
 315         ddb_entry = sess->dd_data;
 316         memset(ddb_entry, 0, sizeof(*ddb_entry));
 317         ddb_entry->ha = ha;
 318         ddb_entry->sess = sess;
 319         return ddb_entry;
 320 }
 321
 322 static void qla4xxx_scan_start(struct Scsi_Host *shost)
 323 {
 324         struct scsi_qla_host *ha = shost_priv(shost);
 325         struct ddb_entry *ddb_entry, *ddbtemp;
 326
 327         /* finish setup of sessions that were already setup in firmware */
 328         list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
 329                 if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
 330                         qla4xxx_add_sess(ddb_entry);
 331         }
 332 }
 333
 334 /*
 335  * Timer routines
 336  */
 337
 338 static void qla4xxx_start_timer(struct scsi_qla_host *ha, void *func,
 339                                 unsigned long interval)
 340 {
 341         DEBUG(printk("scsi: %s: Starting timer thread for adapter %d\n",
 342                      __func__, ha->host->host_no));
 343         init_timer(&ha->timer);
 344         ha->timer.expires = jiffies + interval * HZ;
 345         ha->timer.data = (unsigned long)ha;
 346         ha->timer.function = (void (*)(unsigned long))func;
 347         add_timer(&ha->timer);
 348         ha->timer_active = 1;
 349 }
 350
 351 static void qla4xxx_stop_timer(struct scsi_qla_host *ha)
 352 {
 353         del_timer_sync(&ha->timer);
 354         ha->timer_active = 0;
 355 }
 356
 357 /***
 358  * qla4xxx_mark_device_missing - mark a device as missing.
 359  * @ha: Pointer to host adapter structure.
 360  * @ddb_entry: Pointer to device database entry
 361  *
 362  * This routine marks a device missing and resets the relogin retry count.
 363  **/
 364 void qla4xxx_mark_device_missing(struct scsi_qla_host *ha,
 365                                  struct ddb_entry *ddb_entry)
 366 {
 367         atomic_set(&ddb_entry->state, DDB_STATE_MISSING);
 368         DEBUG3(printk("scsi%d:%d:%d: index [%d] marked MISSING\n",
 369                       ha->host_no, ddb_entry->bus, ddb_entry->target,
 370                       ddb_entry->fw_ddb_index));
 371         iscsi_block_session(ddb_entry->sess);
 372         iscsi_conn_error_event(ddb_entry->conn, ISCSI_ERR_CONN_FAILED);
 373 }
 374
 375 static struct srb* qla4xxx_get_new_srb(struct scsi_qla_host *ha,
 376                                        struct ddb_entry *ddb_entry,
 377                                        struct scsi_cmnd *cmd,
 378                                        void (*done)(struct scsi_cmnd *))
 379 {
 380         struct srb *srb;
 381
 382         srb = mempool_alloc(ha->srb_mempool, GFP_ATOMIC);
 383         if (!srb)
 384                 return srb;
 385
 386         atomic_set(&srb->ref_count, 1);
 387         srb->ha = ha;
 388         srb->ddb = ddb_entry;
 389         srb->cmd = cmd;
 390         srb->flags = 0;
 391         cmd->SCp.ptr = (void *)srb;
 392         cmd->scsi_done = done;
 393
 394         return srb;
 395 }
 396
 397 static void qla4xxx_srb_free_dma(struct scsi_qla_host *ha, struct srb *srb)
 398 {
 399         struct scsi_cmnd *cmd = srb->cmd;
 400
 401         if (srb->flags & SRB_DMA_VALID) {
 402                 scsi_dma_unmap(cmd);
 403                 srb->flags &= ~SRB_DMA_VALID;
 404         }
 405         cmd->SCp.ptr = NULL;
 406 }
 407
 408 void qla4xxx_srb_compl(struct scsi_qla_host *ha, struct srb *srb)
 409 {
 410         struct scsi_cmnd *cmd = srb->cmd;
 411
 412         qla4xxx_srb_free_dma(ha, srb);
 413
 414         mempool_free(srb, ha->srb_mempool);
 415
 416         cmd->scsi_done(cmd);
 417 }
 418
 419 /**
 420  * qla4xxx_queuecommand - scsi layer issues scsi command to driver.
 421  * @cmd: Pointer to Linux's SCSI command structure
 422  * @done_fn: Function that the driver calls to notify the SCSI mid-layer
 423  *      that the command has been processed.
 424  *
 425  * Remarks:
 426  * This routine is invoked by Linux to send a SCSI command to the driver.
 427  * The mid-level driver tries to ensure that queuecommand never gets
 428  * invoked concurrently with itself or the interrupt handler (although
 429  * the interrupt handler may call this routine as part of request-
 430  * completion handling).   Unfortunely, it sometimes calls the scheduler
 431  * in interrupt context which is a big NO! NO!.
 432  **/
 433 static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
 434                                 void (*done)(struct scsi_cmnd *))
 435 {
 436         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
 437         struct ddb_entry *ddb_entry = cmd->device->hostdata;
 438         struct iscsi_cls_session *sess = ddb_entry->sess;
 439         struct srb *srb;
 440         int rval;
 441
 442         if (!sess) {
 443                 cmd->result = DID_IMM_RETRY << 16;
 444                 goto qc_fail_command;
 445         }
 446
 447         rval = iscsi_session_chkready(sess);
 448         if (rval) {
 449                 cmd->result = rval;
 450                 goto qc_fail_command;
 451         }
 452
 453         if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 454                 if (atomic_read(&ddb_entry->state) == DDB_STATE_DEAD) {
 455                         cmd->result = DID_NO_CONNECT << 16;
 456                         goto qc_fail_command;
 457                 }
 458                 return SCSI_MLQUEUE_TARGET_BUSY;
 459         }
 460
 461         if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
 462                 goto qc_host_busy;
 463
 464         spin_unlock_irq(ha->host->host_lock);
 465
 466         srb = qla4xxx_get_new_srb(ha, ddb_entry, cmd, done);
 467         if (!srb)
 468                 goto qc_host_busy_lock;
 469
 470         rval = qla4xxx_send_command_to_isp(ha, srb);
 471         if (rval != QLA_SUCCESS)
 472                 goto qc_host_busy_free_sp;
 473
 474         spin_lock_irq(ha->host->host_lock);
 475         return 0;
 476
 477 qc_host_busy_free_sp:
 478         qla4xxx_srb_free_dma(ha, srb);
 479         mempool_free(srb, ha->srb_mempool);
 480
 481 qc_host_busy_lock:
 482         spin_lock_irq(ha->host->host_lock);
 483
 484 qc_host_busy:
 485         return SCSI_MLQUEUE_HOST_BUSY;
 486
 487 qc_fail_command:
 488         done(cmd);
 489
 490         return 0;
 491 }
 492
 493 /**
 494  * qla4xxx_mem_free - frees memory allocated to adapter
 495  * @ha: Pointer to host adapter structure.
 496  *
 497  * Frees memory previously allocated by qla4xxx_mem_alloc
 498  **/
 499 static void qla4xxx_mem_free(struct scsi_qla_host *ha)
 500 {
 501         if (ha->queues)
 502                 dma_free_coherent(&ha->pdev->dev, ha->queues_len, ha->queues,
 503                                   ha->queues_dma);
 504
 505         ha->queues_len = 0;
 506         ha->queues = NULL;
 507         ha->queues_dma = 0;
 508         ha->request_ring = NULL;
 509         ha->request_dma = 0;
 510         ha->response_ring = NULL;
 511         ha->response_dma = 0;
 512         ha->shadow_regs = NULL;
 513         ha->shadow_regs_dma = 0;
 514
 515         /* Free srb pool. */
 516         if (ha->srb_mempool)
 517                 mempool_destroy(ha->srb_mempool);
 518
 519         ha->srb_mempool = NULL;
 520
 521         /* release io space registers  */
 522         if (ha->reg)
 523                 iounmap(ha->reg);
 524         pci_release_regions(ha->pdev);
 525 }
 526
 527 /**
 528  * qla4xxx_mem_alloc - allocates memory for use by adapter.
 529  * @ha: Pointer to host adapter structure
 530  *
 531  * Allocates DMA memory for request and response queues. Also allocates memory
 532  * for srbs.
 533  **/
 534 static int qla4xxx_mem_alloc(struct scsi_qla_host *ha)
 535 {
 536         unsigned long align;
 537
 538         /* Allocate contiguous block of DMA memory for queues. */
 539         ha->queues_len = ((REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 540                           (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE) +
 541                           sizeof(struct shadow_regs) +
 542                           MEM_ALIGN_VALUE +
 543                           (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
 544         ha->queues = dma_alloc_coherent(&ha->pdev->dev, ha->queues_len,
 545                                         &ha->queues_dma, GFP_KERNEL);
 546         if (ha->queues == NULL) {
 547                 dev_warn(&ha->pdev->dev,
 548                         "Memory Allocation failed - queues.\n");
 549
 550                 goto mem_alloc_error_exit;
 551         }
 552         memset(ha->queues, 0, ha->queues_len);
 553
 554         /*
 555          * As per RISC alignment requirements -- the bus-address must be a
 556          * multiple of the request-ring size (in bytes).
 557          */
 558         align = 0;
 559         if ((unsigned long)ha->queues_dma & (MEM_ALIGN_VALUE - 1))
 560                 align = MEM_ALIGN_VALUE - ((unsigned long)ha->queues_dma &
 561                                            (MEM_ALIGN_VALUE - 1));
 562
 563         /* Update request and response queue pointers. */
 564         ha->request_dma = ha->queues_dma + align;
 565         ha->request_ring = (struct queue_entry *) (ha->queues + align);
 566         ha->response_dma = ha->queues_dma + align +
 567                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE);
 568         ha->response_ring = (struct queue_entry *) (ha->queues + align +
 569                                                     (REQUEST_QUEUE_DEPTH *
 570                                                      QUEUE_SIZE));
 571         ha->shadow_regs_dma = ha->queues_dma + align +
 572                 (REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
 573                 (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE);
 574         ha->shadow_regs = (struct shadow_regs *) (ha->queues + align +
 575                                                   (REQUEST_QUEUE_DEPTH *
 576                                                    QUEUE_SIZE) +
 577                                                   (RESPONSE_QUEUE_DEPTH *
 578                                                    QUEUE_SIZE));
 579
 580         /* Allocate memory for srb pool. */
 581         ha->srb_mempool = mempool_create(SRB_MIN_REQ, mempool_alloc_slab,
 582                                          mempool_free_slab, srb_cachep);
 583         if (ha->srb_mempool == NULL) {
 584                 dev_warn(&ha->pdev->dev,
 585                         "Memory Allocation failed - SRB Pool.\n");
 586
 587                 goto mem_alloc_error_exit;
 588         }
 589
 590         return QLA_SUCCESS;
 591
 592 mem_alloc_error_exit:
 593         qla4xxx_mem_free(ha);
 594         return QLA_ERROR;
 595 }
 596
 597 /**
 598  * qla4xxx_timer - checks every second for work to do.
 599  * @ha: Pointer to host adapter structure.
 600  **/
 601 static void qla4xxx_timer(struct scsi_qla_host *ha)
 602 {
 603         struct ddb_entry *ddb_entry, *dtemp;
 604         int start_dpc = 0;
 605
 606         /* Search for relogin's to time-out and port down retry. */
 607         list_for_each_entry_safe(ddb_entry, dtemp, &ha->ddb_list, list) {
 608                 /* Count down time between sending relogins */
 609                 if (adapter_up(ha) &&
 610                     !test_bit(DF_RELOGIN, &ddb_entry->flags) &&
 611                     atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
 612                         if (atomic_read(&ddb_entry->retry_relogin_timer) !=
 613                             INVALID_ENTRY) {
 614                                 if (atomic_read(&ddb_entry->retry_relogin_timer)
 615                                                 == 0) {
 616                                         atomic_set(&ddb_entry->
 617                                                 retry_relogin_timer,
 618                                                 INVALID_ENTRY);
 619                                         set_bit(DPC_RELOGIN_DEVICE,
 620                                                 &ha->dpc_flags);
 621                                         set_bit(DF_RELOGIN, &ddb_entry->flags);
 622                                         DEBUG2(printk("scsi%ld: %s: index [%d]"
 623                                                       " login device\n",
 624                                                       ha->host_no, __func__,
 625                                                       ddb_entry->fw_ddb_index));
 626                                 } else
 627                                         atomic_dec(&ddb_entry->
 628                                                         retry_relogin_timer);
 629                         }
 630                 }
 631
 632                 /* Wait for relogin to timeout */
 633                 if (atomic_read(&ddb_entry->relogin_timer) &&
 634                     (atomic_dec_and_test(&ddb_entry->relogin_timer) != 0)) {
 635                         /*
 636                          * If the relogin times out and the device is
 637                          * still NOT ONLINE then try and relogin again.
 638                          */
 639                         if (atomic_read(&ddb_entry->state) !=
 640                             DDB_STATE_ONLINE &&
 641                             ddb_entry->fw_ddb_device_state ==
 642                             DDB_DS_SESSION_FAILED) {
 643                                 /* Reset retry relogin timer */
 644                                 atomic_inc(&ddb_entry->relogin_retry_count);
 645                                 DEBUG2(printk("scsi%ld: index[%d] relogin"
 646                                               " timed out-retrying"
 647                                               " relogin (%d)\n",
 648                                               ha->host_no,
 649                                               ddb_entry->fw_ddb_index,
 650                                               atomic_read(&ddb_entry->
 651                                                           relogin_retry_count))
 652                                         );
 653                                 start_dpc++;
 654                                 DEBUG(printk("scsi%ld:%d:%d: index [%d] "
 655                                              "initate relogin after"
 656                                              " %d seconds\n",
 657                                              ha->host_no, ddb_entry->bus,
 658                                              ddb_entry->target,
 659                                              ddb_entry->fw_ddb_index,
 660                                              ddb_entry->default_time2wait + 4)
 661                                         );
 662
 663                                 atomic_set(&ddb_entry->retry_relogin_timer,
 664                                            ddb_entry->default_time2wait + 4);
 665                         }
 666                 }
 667         }
 668
 669         /* Check for heartbeat interval. */
 670         if (ha->firmware_options & FWOPT_HEARTBEAT_ENABLE &&
 671             ha->heartbeat_interval != 0) {
 672                 ha->seconds_since_last_heartbeat++;
 673                 if (ha->seconds_since_last_heartbeat >
 674                     ha->heartbeat_interval + 2)
 675                         set_bit(DPC_RESET_HA, &ha->dpc_flags);
 676         }
 677
 678
 679         /* Wakeup the dpc routine for this adapter, if needed. */
 680         if ((start_dpc ||
 681              test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
 682              test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags) ||
 683              test_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags) ||
 684              test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
 685              test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
 686              test_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags) ||
 687              test_bit(DPC_AEN, &ha->dpc_flags)) &&
 688              ha->dpc_thread) {
 689                 DEBUG2(printk("scsi%ld: %s: scheduling dpc routine"
 690                               " - dpc flags = 0x%lx\n",
 691                               ha->host_no, __func__, ha->dpc_flags));
 692                 queue_work(ha->dpc_thread, &ha->dpc_work);
 693         }
 694
 695         /* Reschedule timer thread to call us back in one second */
 696         mod_timer(&ha->timer, jiffies + HZ);
 697
 698         DEBUG2(ha->seconds_since_last_intr++);
 699 }
 700
 701 /**
 702  * qla4xxx_cmd_wait - waits for all outstanding commands to complete
 703  * @ha: Pointer to host adapter structure.
 704  *
 705  * This routine stalls the driver until all outstanding commands are returned.
 706  * Caller must release the Hardware Lock prior to calling this routine.
 707  **/
 708 static int qla4xxx_cmd_wait(struct scsi_qla_host *ha)
 709 {
 710         uint32_t index = 0;
 711         int stat = QLA_SUCCESS;
 712         unsigned long flags;
 713         struct scsi_cmnd *cmd;
 714         int wait_cnt = WAIT_CMD_TOV;    /*
 715                                          * Initialized for 30 seconds as we
 716                                          * expect all commands to retuned
 717                                          * ASAP.
 718                                          */
 719
 720         while (wait_cnt) {
 721                 spin_lock_irqsave(&ha->hardware_lock, flags);
 722                 /* Find a command that hasn't completed. */
 723                 for (index = 0; index < ha->host->can_queue; index++) {
 724                         cmd = scsi_host_find_tag(ha->host, index);
 725                         if (cmd != NULL)
 726                                 break;
 727                 }
 728                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 729
 730                 /* If No Commands are pending, wait is complete */
 731                 if (index == ha->host->can_queue) {
 732                         break;
 733                 }
 734
 735                 /* If we timed out on waiting for commands to come back
 736                  * return ERROR.
 737                  */
 738                 wait_cnt--;
 739                 if (wait_cnt == 0)
 740                         stat = QLA_ERROR;
 741                 else {
 742                         msleep(1000);
 743                 }
 744         }                       /* End of While (wait_cnt) */
 745
 746         return stat;
 747 }
 748
 749 void qla4xxx_hw_reset(struct scsi_qla_host *ha)
 750 {
 751         uint32_t ctrl_status;
 752         unsigned long flags = 0;
 753
 754         DEBUG2(printk(KERN_ERR "scsi%ld: %s\n", ha->host_no, __func__));
 755
 756         spin_lock_irqsave(&ha->hardware_lock, flags);
 757
 758         /*
 759          * If the SCSI Reset Interrupt bit is set, clear it.
 760          * Otherwise, the Soft Reset won't work.
 761          */
 762         ctrl_status = readw(&ha->reg->ctrl_status);
 763         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0)
 764                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 765
 766         /* Issue Soft Reset */
 767         writel(set_rmask(CSR_SOFT_RESET), &ha->reg->ctrl_status);
 768         readl(&ha->reg->ctrl_status);
 769
 770         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 771 }
 772
 773 /**
 774  * qla4xxx_soft_reset - performs soft reset.
 775  * @ha: Pointer to host adapter structure.
 776  **/
 777 int qla4xxx_soft_reset(struct scsi_qla_host *ha)
 778 {
 779         uint32_t max_wait_time;
 780         unsigned long flags = 0;
 781         int status = QLA_ERROR;
 782         uint32_t ctrl_status;
 783
 784         qla4xxx_hw_reset(ha);
 785
 786         /* Wait until the Network Reset Intr bit is cleared */
 787         max_wait_time = RESET_INTR_TOV;
 788         do {
 789                 spin_lock_irqsave(&ha->hardware_lock, flags);
 790                 ctrl_status = readw(&ha->reg->ctrl_status);
 791                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 792
 793                 if ((ctrl_status & CSR_NET_RESET_INTR) == 0)
 794                         break;
 795
 796                 msleep(1000);
 797         } while ((--max_wait_time));
 798
 799         if ((ctrl_status & CSR_NET_RESET_INTR) != 0) {
 800                 DEBUG2(printk(KERN_WARNING
 801                               "scsi%ld: Network Reset Intr not cleared by "
 802                               "Network function, clearing it now!\n",
 803                               ha->host_no));
 804                 spin_lock_irqsave(&ha->hardware_lock, flags);
 805                 writel(set_rmask(CSR_NET_RESET_INTR), &ha->reg->ctrl_status);
 806                 readl(&ha->reg->ctrl_status);
 807                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 808         }
 809
 810         /* Wait until the firmware tells us the Soft Reset is done */
 811         max_wait_time = SOFT_RESET_TOV;
 812         do {
 813                 spin_lock_irqsave(&ha->hardware_lock, flags);
 814                 ctrl_status = readw(&ha->reg->ctrl_status);
 815                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 816
 817                 if ((ctrl_status & CSR_SOFT_RESET) == 0) {
 818                         status = QLA_SUCCESS;
 819                         break;
 820                 }
 821
 822                 msleep(1000);
 823         } while ((--max_wait_time));
 824
 825         /*
 826          * Also, make sure that the SCSI Reset Interrupt bit has been cleared
 827          * after the soft reset has taken place.
 828          */
 829         spin_lock_irqsave(&ha->hardware_lock, flags);
 830         ctrl_status = readw(&ha->reg->ctrl_status);
 831         if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0) {
 832                 writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
 833                 readl(&ha->reg->ctrl_status);
 834         }
 835         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 836
 837         /* If soft reset fails then most probably the bios on other
 838          * function is also enabled.
 839          * Since the initialization is sequential the other fn
 840          * wont be able to acknowledge the soft reset.
 841          * Issue a force soft reset to workaround this scenario.
 842          */
 843         if (max_wait_time == 0) {
 844                 /* Issue Force Soft Reset */
 845                 spin_lock_irqsave(&ha->hardware_lock, flags);
 846                 writel(set_rmask(CSR_FORCE_SOFT_RESET), &ha->reg->ctrl_status);
 847                 readl(&ha->reg->ctrl_status);
 848                 spin_unlock_irqrestore(&ha->hardware_lock, flags);
 849                 /* Wait until the firmware tells us the Soft Reset is done */
 850                 max_wait_time = SOFT_RESET_TOV;
 851                 do {
 852                         spin_lock_irqsave(&ha->hardware_lock, flags);
 853                         ctrl_status = readw(&ha->reg->ctrl_status);
 854                         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 855
 856                         if ((ctrl_status & CSR_FORCE_SOFT_RESET) == 0) {
 857                                 status = QLA_SUCCESS;
 858                                 break;
 859                         }
 860
 861                         msleep(1000);
 862                 } while ((--max_wait_time));
 863         }
 864
 865         return status;
 866 }
 867
 868 /**
 869  * qla4xxx_flush_active_srbs - returns all outstanding i/o requests to O.S.
 870  * @ha: Pointer to host adapter structure.
 871  *
 872  * This routine is called just prior to a HARD RESET to return all
 873  * outstanding commands back to the Operating System.
 874  * Caller should make sure that the following locks are released
 875  * before this calling routine: Hardware lock, and io_request_lock.
 876  **/
 877 static void qla4xxx_flush_active_srbs(struct scsi_qla_host *ha)
 878 {
 879         struct srb *srb;
 880         int i;
 881         unsigned long flags;
 882
 883         spin_lock_irqsave(&ha->hardware_lock, flags);
 884         for (i = 0; i < ha->host->can_queue; i++) {
 885                 srb = qla4xxx_del_from_active_array(ha, i);
 886                 if (srb != NULL) {
 887                         srb->cmd->result = DID_RESET << 16;
 888                         qla4xxx_srb_compl(ha, srb);
 889                 }
 890         }
 891         spin_unlock_irqrestore(&ha->hardware_lock, flags);
 892
 893 }
 894
 895 /**
 896  * qla4xxx_recover_adapter - recovers adapter after a fatal error
 897  * @ha: Pointer to host adapter structure.
 898  * @renew_ddb_list: Indicates what to do with the adapter's ddb list
 899  *
 900  * renew_ddb_list value can be 0=preserve ddb list, 1=destroy and rebuild
 901  * ddb list.
 902  **/
 903 static int qla4xxx_recover_adapter(struct scsi_qla_host *ha,
 904                                 uint8_t renew_ddb_list)
 905 {
 906         int status;
 907
 908         /* Stall incoming I/O until we are done */
 909         clear_bit(AF_ONLINE, &ha->flags);
 910
 911         DEBUG2(printk("scsi%ld: %s calling qla4xxx_cmd_wait\n", ha->host_no,
 912                       __func__));
 913
 914         /* Wait for outstanding commands to complete.
 915          * Stalls the driver for max 30 secs
 916          */
 917         status = qla4xxx_cmd_wait(ha);
 918
 919         qla4xxx_disable_intrs(ha);
 920
 921         /* Flush any pending ddb changed AENs */
 922         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 923
 924         qla4xxx_flush_active_srbs(ha);
 925
 926         /* Reset the firmware.  If successful, function
 927          * returns with ISP interrupts enabled.
 928          */
 929         DEBUG2(printk("scsi%ld: %s - Performing soft reset..\n",
 930                       ha->host_no, __func__));
 931         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
 932                 status = qla4xxx_soft_reset(ha);
 933         else
 934                 status = QLA_ERROR;
 935
 936         /* Flush any pending ddb changed AENs */
 937         qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
 938
 939         /* Re-initialize firmware. If successful, function returns
 940          * with ISP interrupts enabled */
 941         if (status == QLA_SUCCESS) {
 942                 DEBUG2(printk("scsi%ld: %s - Initializing adapter..\n",
 943                               ha->host_no, __func__));
 944
 945                 /* If successful, AF_ONLINE flag set in
 946                  * qla4xxx_initialize_adapter */
 947                 status = qla4xxx_initialize_adapter(ha, renew_ddb_list);
 948         }
 949
 950         /* Failed adapter initialization?
 951          * Retry reset_ha only if invoked via DPC (DPC_RESET_HA) */
 952         if ((test_bit(AF_ONLINE, &ha->flags) == 0) &&
 953             (test_bit(DPC_RESET_HA, &ha->dpc_flags))) {
 954                 /* Adapter initialization failed, see if we can retry
 955                  * resetting the ha */
 956                 if (!test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags)) {
 957                         ha->retry_reset_ha_cnt = MAX_RESET_HA_RETRIES;
 958                         DEBUG2(printk("scsi%ld: recover adapter - retrying "
 959                                       "(%d) more times\n", ha->host_no,
 960                                       ha->retry_reset_ha_cnt));
 961                         set_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 962                         status = QLA_ERROR;
 963                 } else {
 964                         if (ha->retry_reset_ha_cnt > 0) {
 965                                 /* Schedule another Reset HA--DPC will retry */
 966                                 ha->retry_reset_ha_cnt--;
 967                                 DEBUG2(printk("scsi%ld: recover adapter - "
 968                                               "retry remaining %d\n",
 969                                               ha->host_no,
 970                                               ha->retry_reset_ha_cnt));
 971                                 status = QLA_ERROR;
 972                         }
 973
 974                         if (ha->retry_reset_ha_cnt == 0) {
 975                                 /* Recover adapter retries have been exhausted.
 976                                  * Adapter DEAD */
 977                                 DEBUG2(printk("scsi%ld: recover adapter "
 978                                               "failed - board disabled\n",
 979                                               ha->host_no));
 980                                 qla4xxx_flush_active_srbs(ha);
 981                                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 982                                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 983                                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST,
 984                                           &ha->dpc_flags);
 985                                 status = QLA_ERROR;
 986                         }
 987                 }
 988         } else {
 989                 clear_bit(DPC_RESET_HA, &ha->dpc_flags);
 990                 clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags);
 991                 clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
 992         }
 993
 994         ha->adapter_error_count++;
 995
 996         if (status == QLA_SUCCESS)
 997                 qla4xxx_enable_intrs(ha);
 998
 999         DEBUG2(printk("scsi%ld: recover adapter .. DONE\n", ha->host_no));
1000         return status;
1001 }
1002
1003 /**
1004  * qla4xxx_do_dpc - dpc routine
1005  * @data: in our case pointer to adapter structure
1006  *
1007  * This routine is a task that is schedule by the interrupt handler
1008  * to perform the background processing for interrupts.  We put it
1009  * on a task queue that is consumed whenever the scheduler runs; that's
1010  * so you can do anything (i.e. put the process to sleep etc).  In fact,
1011  * the mid-level tries to sleep when it reaches the driver threshold
1012  * "host->can_queue". This can cause a panic if we were in our interrupt code.
1013  **/
1014 static void qla4xxx_do_dpc(struct work_struct *work)
1015 {
1016         struct scsi_qla_host *ha =
1017                 container_of(work, struct scsi_qla_host, dpc_work);
1018         struct ddb_entry *ddb_entry, *dtemp;
1019         int status = QLA_ERROR;
1020
1021         DEBUG2(printk("scsi%ld: %s: DPC handler waking up."
1022                 "flags = 0x%08lx, dpc_flags = 0x%08lx ctrl_stat = 0x%08x\n",
1023                 ha->host_no, __func__, ha->flags, ha->dpc_flags,
1024                 readw(&ha->reg->ctrl_status)));
1025
1026         /* Initialization not yet finished. Don't do anything yet. */
1027         if (!test_bit(AF_INIT_DONE, &ha->flags))
1028                 return;
1029
1030         if (adapter_up(ha) ||
1031             test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
1032             test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
1033             test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags)) {
1034                 if (test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
1035                         test_bit(DPC_RESET_HA, &ha->dpc_flags))
1036                         qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);
1037
1038                 if (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags)) {
1039                         uint8_t wait_time = RESET_INTR_TOV;
1040
1041                         while ((readw(&ha->reg->ctrl_status) &
1042                                 (CSR_SOFT_RESET | CSR_FORCE_SOFT_RESET)) != 0) {
1043                                 if (--wait_time == 0)
1044                                         break;
1045                                 msleep(1000);
1046                         }
1047                         if (wait_time == 0)
1048                                 DEBUG2(printk("scsi%ld: %s: SR|FSR "
1049                                               "bit not cleared-- resetting\n",
1050                                               ha->host_no, __func__));
1051                         qla4xxx_flush_active_srbs(ha);
1052                         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS) {
1053                                 qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
1054                                 status = qla4xxx_initialize_adapter(ha,
1055                                                 PRESERVE_DDB_LIST);
1056                         }
1057                         clear_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);
1058                         if (status == QLA_SUCCESS)
1059                                 qla4xxx_enable_intrs(ha);
1060                 }
1061         }
1062
1063         /* ---- process AEN? --- */
1064         if (test_and_clear_bit(DPC_AEN, &ha->dpc_flags))
1065                 qla4xxx_process_aen(ha, PROCESS_ALL_AENS);
1066
1067         /* ---- Get DHCP IP Address? --- */
1068         if (test_and_clear_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags))
1069                 qla4xxx_get_dhcp_ip_address(ha);
1070
1071         /* ---- relogin device? --- */
1072         if (adapter_up(ha) &&
1073             test_and_clear_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags)) {
1074                 list_for_each_entry_safe(ddb_entry, dtemp,
1075                                          &ha->ddb_list, list) {
1076                         if (test_and_clear_bit(DF_RELOGIN, &ddb_entry->flags) &&
1077                             atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
1078                                 qla4xxx_relogin_device(ha, ddb_entry);
1079
1080                         /*
1081                          * If mbx cmd times out there is no point
1082                          * in continuing further.
1083                          * With large no of targets this can hang
1084                          * the system.
1085                          */
1086                         if (test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
1087                                 printk(KERN_WARNING "scsi%ld: %s: "
1088                                        "need to reset hba\n",
1089                                        ha->host_no, __func__);
1090                                 break;
1091                         }
1092                 }
1093         }
1094 }
1095
1096 /**
1097  * qla4xxx_free_adapter - release the adapter
1098  * @ha: pointer to adapter structure
1099  **/
1100 static void qla4xxx_free_adapter(struct scsi_qla_host *ha)
1101 {
1102
1103         if (test_bit(AF_INTERRUPTS_ON, &ha->flags)) {
1104                 /* Turn-off interrupts on the card. */
1105                 qla4xxx_disable_intrs(ha);
1106         }
1107
1108         /* Kill the kernel thread for this host */
1109         if (ha->dpc_thread)
1110                 destroy_workqueue(ha->dpc_thread);
1111
1112         /* Issue Soft Reset to put firmware in unknown state */
1113         if (ql4xxx_lock_drvr_wait(ha) == QLA_SUCCESS)
1114                 qla4xxx_hw_reset(ha);
1115
1116         /* Remove timer thread, if present */
1117         if (ha->timer_active)
1118                 qla4xxx_stop_timer(ha);
1119
1120         /* Detach interrupts */
1121         if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
1122                 free_irq(ha->pdev->irq, ha);
1123
1124         /* free extra memory */
1125         qla4xxx_mem_free(ha);
1126
1127         pci_disable_device(ha->pdev);
1128
1129 }
1130
1131 /***
1132  * qla4xxx_iospace_config - maps registers
1133  * @ha: pointer to adapter structure
1134  *
1135  * This routines maps HBA's registers from the pci address space
1136  * into the kernel virtual address space for memory mapped i/o.
1137  **/
1138 static int qla4xxx_iospace_config(struct scsi_qla_host *ha)
1139 {
1140         unsigned long pio, pio_len, pio_flags;
1141         unsigned long mmio, mmio_len, mmio_flags;
1142
1143         pio = pci_resource_start(ha->pdev, 0);
1144         pio_len = pci_resource_len(ha->pdev, 0);
1145         pio_flags = pci_resource_flags(ha->pdev, 0);
1146         if (pio_flags & IORESOURCE_IO) {
1147                 if (pio_len < MIN_IOBASE_LEN) {
1148                         dev_warn(&ha->pdev->dev,
1149                                 "Invalid PCI I/O region size\n");
1150                         pio = 0;
1151                 }
1152         } else {
1153                 dev_warn(&ha->pdev->dev, "region #0 not a PIO resource\n");
1154                 pio = 0;
1155         }
1156
1157         /* Use MMIO operations for all accesses. */
1158         mmio = pci_resource_start(ha->pdev, 1);
1159         mmio_len = pci_resource_len(ha->pdev, 1);
1160         mmio_flags = pci_resource_flags(ha->pdev, 1);
1161
1162         if (!(mmio_flags & IORESOURCE_MEM)) {
1163                 dev_err(&ha->pdev->dev,
1164                         "region #0 not an MMIO resource, aborting\n");
1165
1166                 goto iospace_error_exit;
1167         }
1168         if (mmio_len < MIN_IOBASE_LEN) {
1169                 dev_err(&ha->pdev->dev,
1170                         "Invalid PCI mem region size, aborting\n");
1171                 goto iospace_error_exit;
1172         }
1173
1174         if (pci_request_regions(ha->pdev, DRIVER_NAME)) {
1175                 dev_warn(&ha->pdev->dev,
1176                         "Failed to reserve PIO/MMIO regions\n");
1177
1178                 goto iospace_error_exit;
1179         }
1180
1181         ha->pio_address = pio;
1182         ha->pio_length = pio_len;
1183         ha->reg = ioremap(mmio, MIN_IOBASE_LEN);
1184         if (!ha->reg) {
1185                 dev_err(&ha->pdev->dev,
1186                         "cannot remap MMIO, aborting\n");
1187
1188                 goto iospace_error_exit;
1189         }
1190
1191         return 0;
1192
1193 iospace_error_exit:
1194         return -ENOMEM;
1195 }
1196
1197 /**
1198  * qla4xxx_probe_adapter - callback function to probe HBA
1199  * @pdev: pointer to pci_dev structure
1200  * @pci_device_id: pointer to pci_device entry
1201  *
1202  * This routine will probe for Qlogic 4xxx iSCSI host adapters.
1203  * It returns zero if successful. It also initializes all data necessary for
1204  * the driver.
1205  **/
1206 static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
1207                                            const struct pci_device_id *ent)
1208 {
1209         int ret = -ENODEV, status;
1210         struct Scsi_Host *host;
1211         struct scsi_qla_host *ha;
1212         uint8_t init_retry_count = 0;
1213         char buf[34];
1214
1215         if (pci_enable_device(pdev))
1216                 return -1;
1217
1218         host = scsi_host_alloc(&qla4xxx_driver_template, sizeof(*ha));
1219         if (host == NULL) {
1220                 printk(KERN_WARNING
1221                        "qla4xxx: Couldn't allocate host from scsi layer!\n");
1222                 goto probe_disable_device;
1223         }
1224
1225         /* Clear our data area */
1226         ha = (struct scsi_qla_host *) host->hostdata;
1227         memset(ha, 0, sizeof(*ha));
1228
1229         /* Save the information from PCI BIOS.  */
1230         ha->pdev = pdev;
1231         ha->host = host;
1232         ha->host_no = host->host_no;
1233
1234         /* Configure PCI I/O space. */
1235         ret = qla4xxx_iospace_config(ha);
1236         if (ret)
1237                 goto probe_failed;
1238
1239         dev_info(&ha->pdev->dev, "Found an ISP%04x, irq %d, iobase 0x%p\n",
1240                    pdev->device, pdev->irq, ha->reg);
1241
1242         qla4xxx_config_dma_addressing(ha);
1243
1244         /* Initialize lists and spinlocks. */
1245         INIT_LIST_HEAD(&ha->ddb_list);
1246         INIT_LIST_HEAD(&ha->free_srb_q);
1247
1248         mutex_init(&ha->mbox_sem);
1249
1250         spin_lock_init(&ha->hardware_lock);
1251
1252         /* Allocate dma buffers */
1253         if (qla4xxx_mem_alloc(ha)) {
1254                 dev_warn(&ha->pdev->dev,
1255                            "[ERROR] Failed to allocate memory for adapter\n");
1256
1257                 ret = -ENOMEM;
1258                 goto probe_failed;
1259         }
1260
1261         /*
1262          * Initialize the Host adapter request/response queues and
1263          * firmware
1264          * NOTE: interrupts enabled upon successful completion
1265          */
1266         status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1267         while (status == QLA_ERROR && init_retry_count++ < MAX_INIT_RETRIES) {
1268                 DEBUG2(printk("scsi: %s: retrying adapter initialization "
1269                               "(%d)\n", __func__, init_retry_count));
1270                 qla4xxx_soft_reset(ha);
1271                 status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
1272         }
1273         if (status == QLA_ERROR) {
1274                 dev_warn(&ha->pdev->dev, "Failed to initialize adapter\n");
1275
1276                 ret = -ENODEV;
1277                 goto probe_failed;
1278         }
1279
1280         host->cmd_per_lun = 3;
1281         host->max_channel = 0;
1282         host->max_lun = MAX_LUNS - 1;
1283         host->max_id = MAX_TARGETS;
1284         host->max_cmd_len = IOCB_MAX_CDB_LEN;
1285         host->can_queue = MAX_SRBS ;
1286         host->transportt = qla4xxx_scsi_transport;
1287
1288         ret = scsi_init_shared_tag_map(host, MAX_SRBS);
1289         if (ret) {
1290                 dev_warn(&ha->pdev->dev, "scsi_init_shared_tag_map failed\n");
1291                 goto probe_failed;
1292         }
1293
1294         /* Startup the kernel thread for this host adapter. */
1295         DEBUG2(printk("scsi: %s: Starting kernel thread for "
1296                       "qla4xxx_dpc\n", __func__));
1297         sprintf(buf, "qla4xxx_%lu_dpc", ha->host_no);
1298         ha->dpc_thread = create_singlethread_workqueue(buf);
1299         if (!ha->dpc_thread) {
1300                 dev_warn(&ha->pdev->dev, "Unable to start DPC thread!\n");
1301                 ret = -ENODEV;
1302                 goto probe_failed;
1303         }
1304         INIT_WORK(&ha->dpc_work, qla4xxx_do_dpc);
1305
1306         ret = request_irq(pdev->irq, qla4xxx_intr_handler,
1307                           IRQF_DISABLED | IRQF_SHARED, "qla4xxx", ha);
1308         if (ret) {
1309                 dev_warn(&ha->pdev->dev, "Failed to reserve interrupt %d"
1310                         " already in use.\n", pdev->irq);
1311                 goto probe_failed;
1312         }
1313         set_bit(AF_IRQ_ATTACHED, &ha->flags);
1314         host->irq = pdev->irq;
1315         DEBUG(printk("scsi%d: irq %d attached\n", ha->host_no, ha->pdev->irq));
1316
1317         qla4xxx_enable_intrs(ha);
1318
1319         /* Start timer thread. */
1320         qla4xxx_start_timer(ha, qla4xxx_timer, 1);
1321
1322         set_bit(AF_INIT_DONE, &ha->flags);
1323
1324         pci_set_drvdata(pdev, ha);
1325
1326         ret = scsi_add_host(host, &pdev->dev);
1327         if (ret)
1328                 goto probe_failed;
1329
1330         printk(KERN_INFO
1331                " QLogic iSCSI HBA Driver version: %s\n"
1332                "  QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
1333                qla4xxx_version_str, ha->pdev->device, pci_name(ha->pdev),
1334                ha->host_no, ha->firmware_version[0], ha->firmware_version[1],
1335                ha->patch_number, ha->build_number);
1336         scsi_scan_host(host);
1337         return 0;
1338
1339 probe_failed:
1340         qla4xxx_free_adapter(ha);
1341         scsi_host_put(ha->host);
1342
1343 probe_disable_device:
1344         pci_disable_device(pdev);
1345
1346         return ret;
1347 }
1348
1349 /**
1350  * qla4xxx_remove_adapter - calback function to remove adapter.
1351  * @pci_dev: PCI device pointer
1352  **/
1353 static void __devexit qla4xxx_remove_adapter(struct pci_dev *pdev)
1354 {
1355         struct scsi_qla_host *ha;
1356
1357         ha = pci_get_drvdata(pdev);
1358
1359         qla4xxx_disable_intrs(ha);
1360
1361         while (test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags))
1362                 ssleep(1);
1363
1364         /* remove devs from iscsi_sessions to scsi_devices */
1365         qla4xxx_free_ddb_list(ha);
1366
1367         scsi_remove_host(ha->host);
1368
1369         qla4xxx_free_adapter(ha);
1370
1371         scsi_host_put(ha->host);
1372
1373         pci_set_drvdata(pdev, NULL);
1374 }
1375
1376 /**
1377  * qla4xxx_config_dma_addressing() - Configure OS DMA addressing method.
1378  * @ha: HA context
1379  *
1380  * At exit, the @ha's flags.enable_64bit_addressing set to indicated
1381  * supported addressing method.
1382  */
1383 static void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha)
1384 {
1385         int retval;
1386
1387         /* Update our PCI device dma_mask for full 64 bit mask */
1388         if (pci_set_dma_mask(ha->pdev, DMA_BIT_MASK(64)) == 0) {
1389                 if (pci_set_consistent_dma_mask(ha->pdev, DMA_BIT_MASK(64))) {
1390                         dev_dbg(&ha->pdev->dev,
1391                                   "Failed to set 64 bit PCI consistent mask; "
1392                                    "using 32 bit.\n");
1393                         retval = pci_set_consistent_dma_mask(ha->pdev,
1394                                                              DMA_BIT_MASK(32));
1395                 }
1396         } else
1397                 retval = pci_set_dma_mask(ha->pdev, DMA_BIT_MASK(32));
1398 }
1399
1400 static int qla4xxx_slave_alloc(struct scsi_device *sdev)
1401 {
1402         struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
1403         struct ddb_entry *ddb = sess->dd_data;
1404
1405         sdev->hostdata = ddb;
1406         sdev->tagged_supported = 1;
1407         scsi_activate_tcq(sdev, QL4_DEF_QDEPTH);
1408         return 0;
1409 }
1410
1411 static int qla4xxx_slave_configure(struct scsi_device *sdev)
1412 {
1413         sdev->tagged_supported = 1;
1414         return 0;
1415 }
1416
1417 static void qla4xxx_slave_destroy(struct scsi_device *sdev)
1418 {
1419         scsi_deactivate_tcq(sdev, 1);
1420 }
1421
1422 /**
1423  * qla4xxx_del_from_active_array - returns an active srb
1424  * @ha: Pointer to host adapter structure.
1425  * @index: index into to the active_array
1426  *
1427  * This routine removes and returns the srb at the specified index
1428  **/
1429 struct srb * qla4xxx_del_from_active_array(struct scsi_qla_host *ha, uint32_t index)
1430 {
1431         struct srb *srb = NULL;
1432         struct scsi_cmnd *cmd;
1433
1434         if (!(cmd = scsi_host_find_tag(ha->host, index)))
1435                 return srb;
1436
1437         if (!(srb = (struct srb *)cmd->host_scribble))
1438                 return srb;
1439
1440         /* update counters */
1441         if (srb->flags & SRB_DMA_VALID) {
1442                 ha->req_q_count += srb->iocb_cnt;
1443                 ha->iocb_cnt -= srb->iocb_cnt;
1444                 if (srb->cmd)
1445                         srb->cmd->host_scribble = NULL;
1446         }
1447         return srb;
1448 }
1449
1450 /**
1451  * qla4xxx_eh_wait_on_command - waits for command to be returned by firmware
1452  * @ha: actual ha whose done queue will contain the comd returned by firmware.
1453  * @cmd: Scsi Command to wait on.
1454  *
1455  * This routine waits for the command to be returned by the Firmware
1456  * for some max time.
1457  **/
1458 static int qla4xxx_eh_wait_on_command(struct scsi_qla_host *ha,
1459                                       struct scsi_cmnd *cmd)
1460 {
1461         int done = 0;
1462         struct srb *rp;
1463         uint32_t max_wait_time = EH_WAIT_CMD_TOV;
1464
1465         do {
1466                 /* Checking to see if its returned to OS */
1467                 rp = (struct srb *) cmd->SCp.ptr;
1468                 if (rp == NULL) {
1469                         done++;
1470                         break;
1471                 }
1472
1473                 msleep(2000);
1474         } while (max_wait_time--);
1475
1476         return done;
1477 }
1478
1479 /**
1480  * qla4xxx_wait_for_hba_online - waits for HBA to come online
1481  * @ha: Pointer to host adapter structure
1482  **/
1483 static int qla4xxx_wait_for_hba_online(struct scsi_qla_host *ha)
1484 {
1485         unsigned long wait_online;
1486
1487         wait_online = jiffies + (30 * HZ);
1488         while (time_before(jiffies, wait_online)) {
1489
1490                 if (adapter_up(ha))
1491                         return QLA_SUCCESS;
1492                 else if (ha->retry_reset_ha_cnt == 0)
1493                         return QLA_ERROR;
1494
1495                 msleep(2000);
1496         }
1497
1498         return QLA_ERROR;
1499 }
1500
1501 /**
1502  * qla4xxx_eh_wait_for_commands - wait for active cmds to finish.
1503  * @ha: pointer to to HBA
1504  * @t: target id
1505  * @l: lun id
1506  *
1507  * This function waits for all outstanding commands to a lun to complete. It
1508  * returns 0 if all pending commands are returned and 1 otherwise.
1509  **/
1510 static int qla4xxx_eh_wait_for_commands(struct scsi_qla_host *ha,
1511                                         struct scsi_target *stgt,
1512                                         struct scsi_device *sdev)
1513 {
1514         int cnt;
1515         int status = 0;
1516         struct scsi_cmnd *cmd;
1517
1518         /*
1519          * Waiting for all commands for the designated target or dev
1520          * in the active array
1521          */
1522         for (cnt = 0; cnt < ha->host->can_queue; cnt++) {
1523                 cmd = scsi_host_find_tag(ha->host, cnt);
1524                 if (cmd && stgt == scsi_target(cmd->device) &&
1525                     (!sdev || sdev == cmd->device)) {
1526                         if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
1527                                 status++;
1528                                 break;
1529                         }
1530                 }
1531         }
1532         return status;
1533 }
1534
1535 /**
1536  * qla4xxx_eh_device_reset - callback for target reset.
1537  * @cmd: Pointer to Linux's SCSI command structure
1538  *
1539  * This routine is called by the Linux OS to reset all luns on the
1540  * specified target.
1541  **/
1542 static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
1543 {
1544         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
1545         struct ddb_entry *ddb_entry = cmd->device->hostdata;
1546         int ret = FAILED, stat;
1547
1548         if (!ddb_entry)
1549                 return ret;
1550
1551         dev_info(&ha->pdev->dev,
1552                    "scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
1553                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1554
1555         DEBUG2(printk(KERN_INFO
1556                       "scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
1557                       "dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
1558                       cmd, jiffies, cmd->request->timeout / HZ,
1559                       ha->dpc_flags, cmd->result, cmd->allowed));
1560
1561         /* FIXME: wait for hba to go online */
1562         stat = qla4xxx_reset_lun(ha, ddb_entry, cmd->device->lun);
1563         if (stat != QLA_SUCCESS) {
1564                 dev_info(&ha->pdev->dev, "DEVICE RESET FAILED. %d\n", stat);
1565                 goto eh_dev_reset_done;
1566         }
1567
1568         if (qla4xxx_eh_wait_for_commands(ha, scsi_target(cmd->device),
1569                                          cmd->device)) {
1570                 dev_info(&ha->pdev->dev,
1571                            "DEVICE RESET FAILED - waiting for "
1572                            "commands.\n");
1573                 goto eh_dev_reset_done;
1574         }
1575
1576         /* Send marker. */
1577         if (qla4xxx_send_marker_iocb(ha, ddb_entry, cmd->device->lun,
1578                 MM_LUN_RESET) != QLA_SUCCESS)
1579                 goto eh_dev_reset_done;
1580
1581         dev_info(&ha->pdev->dev,
1582                    "scsi(%ld:%d:%d:%d): DEVICE RESET SUCCEEDED.\n",
1583                    ha->host_no, cmd->device->channel, cmd->device->id,
1584                    cmd->device->lun);
1585
1586         ret = SUCCESS;
1587
1588 eh_dev_reset_done:
1589
1590         return ret;
1591 }
1592
1593 /**
1594  * qla4xxx_eh_target_reset - callback for target reset.
1595  * @cmd: Pointer to Linux's SCSI command structure
1596  *
1597  * This routine is called by the Linux OS to reset the target.
1598  **/
1599 static int qla4xxx_eh_target_reset(struct scsi_cmnd *cmd)
1600 {
1601         struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
1602         struct ddb_entry *ddb_entry = cmd->device->hostdata;
1603         int stat;
1604
1605         if (!ddb_entry)
1606                 return FAILED;
1607
1608         starget_printk(KERN_INFO, scsi_target(cmd->device),
1609                        "WARM TARGET RESET ISSUED.\n");
1610
1611         DEBUG2(printk(KERN_INFO
1612                       "scsi%ld: TARGET_DEVICE_RESET cmd=%p jiffies = 0x%lx, "
1613                       "to=%x,dpc_flags=%lx, status=%x allowed=%d\n",
1614                       ha->host_no, cmd, jiffies, cmd->request->timeout / HZ,
1615                       ha->dpc_flags, cmd->result, cmd->allowed));
1616
1617         stat = qla4xxx_reset_target(ha, ddb_entry);
1618         if (stat != QLA_SUCCESS) {
1619                 starget_printk(KERN_INFO, scsi_target(cmd->device),
1620                                "WARM TARGET RESET FAILED.\n");
1621                 return FAILED;
1622         }
1623
1624         if (qla4xxx_eh_wait_for_commands(ha, scsi_target(cmd->device),
1625                                          NULL)) {
1626                 starget_printk(KERN_INFO, scsi_target(cmd->device),
1627                                "WARM TARGET DEVICE RESET FAILED - "
1628                                "waiting for commands.\n");
1629                 return FAILED;
1630         }
1631
1632         /* Send marker. */
1633         if (qla4xxx_send_marker_iocb(ha, ddb_entry, cmd->device->lun,
1634                 MM_TGT_WARM_RESET) != QLA_SUCCESS) {
1635                 starget_printk(KERN_INFO, scsi_target(cmd->device),
1636                                "WARM TARGET DEVICE RESET FAILED - "
1637                                "marker iocb failed.\n");
1638                 return FAILED;
1639         }
1640
1641         starget_printk(KERN_INFO, scsi_target(cmd->device),
1642                        "WARM TARGET RESET SUCCEEDED.\n");
1643         return SUCCESS;
1644 }
1645
1646 /**
1647  * qla4xxx_eh_host_reset - kernel callback
1648  * @cmd: Pointer to Linux's SCSI command structure
1649  *
1650  * This routine is invoked by the Linux kernel to perform fatal error
1651  * recovery on the specified adapter.
1652  **/
1653 static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd)
1654 {
1655         int return_status = FAILED;
1656         struct scsi_qla_host *ha;
1657
1658         ha = (struct scsi_qla_host *) cmd->device->host->hostdata;
1659
1660         dev_info(&ha->pdev->dev,
1661                    "scsi(%ld:%d:%d:%d): HOST RESET ISSUED.\n", ha->host_no,
1662                    cmd->device->channel, cmd->device->id, cmd->device->lun);
1663
1664         if (qla4xxx_wait_for_hba_online(ha) != QLA_SUCCESS) {
1665                 DEBUG2(printk("scsi%ld:%d: %s: Unable to reset host.  Adapter "
1666                               "DEAD.\n", ha->host_no, cmd->device->channel,
1667                               __func__));
1668
1669                 return FAILED;
1670         }
1671
1672         /* make sure the dpc thread is stopped while we reset the hba */
1673         clear_bit(AF_ONLINE, &ha->flags);
1674         flush_workqueue(ha->dpc_thread);
1675
1676         if (qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST) == QLA_SUCCESS)
1677                 return_status = SUCCESS;
1678
1679         dev_info(&ha->pdev->dev, "HOST RESET %s.\n",
1680                    return_status == FAILED ? "FAILED" : "SUCCEDED");
1681
1682         return return_status;
1683 }
1684
1685
1686 static struct pci_device_id qla4xxx_pci_tbl[] = {
1687         {
1688                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1689                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4010,
1690                 .subvendor      = PCI_ANY_ID,
1691                 .subdevice      = PCI_ANY_ID,
1692         },
1693         {
1694                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1695                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4022,
1696                 .subvendor      = PCI_ANY_ID,
1697                 .subdevice      = PCI_ANY_ID,
1698         },
1699         {
1700                 .vendor         = PCI_VENDOR_ID_QLOGIC,
1701                 .device         = PCI_DEVICE_ID_QLOGIC_ISP4032,
1702                 .subvendor      = PCI_ANY_ID,
1703                 .subdevice      = PCI_ANY_ID,
1704         },
1705         {0, 0},
1706 };
1707 MODULE_DEVICE_TABLE(pci, qla4xxx_pci_tbl);
1708
1709 static struct pci_driver qla4xxx_pci_driver = {
1710         .name           = DRIVER_NAME,
1711         .id_table       = qla4xxx_pci_tbl,
1712         .probe          = qla4xxx_probe_adapter,
1713         .remove         = qla4xxx_remove_adapter,
1714 };
1715
1716 static int __init qla4xxx_module_init(void)
1717 {
1718         int ret;
1719
1720         /* Allocate cache for SRBs. */
1721         srb_cachep = kmem_cache_create("qla4xxx_srbs", sizeof(struct srb), 0,
1722                                        SLAB_HWCACHE_ALIGN, NULL);
1723         if (srb_cachep == NULL) {
1724                 printk(KERN_ERR
1725                        "%s: Unable to allocate SRB cache..."
1726                        "Failing load!\n", DRIVER_NAME);
1727                 ret = -ENOMEM;
1728                 goto no_srp_cache;
1729         }
1730
1731         /* Derive version string. */
1732         strcpy(qla4xxx_version_str, QLA4XXX_DRIVER_VERSION);
1733         if (ql4xextended_error_logging)
1734                 strcat(qla4xxx_version_str, "-debug");
1735
1736         qla4xxx_scsi_transport =
1737                 iscsi_register_transport(&qla4xxx_iscsi_transport);
1738         if (!qla4xxx_scsi_transport){
1739                 ret = -ENODEV;
1740                 goto release_srb_cache;
1741         }
1742
1743         ret = pci_register_driver(&qla4xxx_pci_driver);
1744         if (ret)
1745                 goto unregister_transport;
1746
1747         printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
1748         return 0;
1749
1750 unregister_transport:
1751         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1752 release_srb_cache:
1753         kmem_cache_destroy(srb_cachep);
1754 no_srp_cache:
1755         return ret;
1756 }
1757
1758 static void __exit qla4xxx_module_exit(void)
1759 {
1760         ql4_mod_unload = 1;
1761         pci_unregister_driver(&qla4xxx_pci_driver);
1762         iscsi_unregister_transport(&qla4xxx_iscsi_transport);
1763         kmem_cache_destroy(srb_cachep);
1764 }
1765
1766 module_init(qla4xxx_module_init);
1767 module_exit(qla4xxx_module_exit);
1768
1769 MODULE_AUTHOR("QLogic Corporation");
1770 MODULE_DESCRIPTION("QLogic iSCSI HBA Driver");
1771 MODULE_LICENSE("GPL");
1772 MODULE_VERSION(QLA4XXX_DRIVER_VERSION);