[SCSI] Initial Commit of qla4xxx

open-iSCSI driver for Qlogic Corporation's iSCSI HBAs

Signed-off-by: Ravi Anand <ravi.anand@qlogic.com>
Signed-off-by: David Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: Doug Maxey <dwm@bubba.enoyolf.org>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 1755 insertions, 0 deletions

diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
new file mode 100644
index 000000000000..5036ebf013a5
--- /dev/null
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -0,0 +1,1755 @@
+/*
+ * QLogic iSCSI HBA Driver
+ * Copyright (c)  2003-2006 QLogic Corporation
+ *
+ * See LICENSE.qla4xxx for copyright and licensing details.
+ */
+#include <linux/moduleparam.h>
+
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsicam.h>
+
+#include "ql4_def.h"
+
+/*
+ * Driver version
+ */
+char qla4xxx_version_str[40];
+
+/*
+ * SRB allocation cache
+ */
+static kmem_cache_t *srb_cachep;
+
+/*
+ * Module parameter information and variables
+ */
+int ql4xdiscoverywait = 60;
+module_param(ql4xdiscoverywait, int, S_IRUGO | S_IRUSR);
+MODULE_PARM_DESC(ql4xdiscoverywait, "Discovery wait time");
+int ql4xdontresethba = 0;
+module_param(ql4xdontresethba, int, S_IRUGO | S_IRUSR);
+MODULE_PARM_DESC(ql4xdontresethba,
+                 "Dont reset the HBA when the driver gets 0x8002 AEN "
+                 " default it will reset hba :0"
+                 " set to 1 to avoid resetting HBA");
+
+int extended_error_logging = 0; /* 0 = off, 1 = log errors */
+module_param(extended_error_logging, int, S_IRUGO | S_IRUSR);
+MODULE_PARM_DESC(extended_error_logging,
+                 "Option to enable extended error logging, "
+                 "Default is 0 - no logging, 1 - debug logging");
+
+/*
+ * SCSI host template entry points
+ */
+
+void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha);
+
+/*
+ * iSCSI template entry points
+ */
+static int qla4xxx_tgt_dscvr(enum iscsi_tgt_dscvr type, uint32_t host_no,
+                             uint32_t enable, struct sockaddr *dst_addr);
+static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
+                                  enum iscsi_param param, char *buf);
+static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
+                                  enum iscsi_param param, char *buf);
+static void qla4xxx_conn_stop(struct iscsi_cls_conn *conn, int flag);
+static int qla4xxx_conn_start(struct iscsi_cls_conn *conn);
+static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session);
+
+/*
+ * SCSI host template entry points
+ */
+static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
+                                void (*done) (struct scsi_cmnd *));
+static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd);
+static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd);
+static int qla4xxx_slave_alloc(struct scsi_device *device);
+static int qla4xxx_slave_configure(struct scsi_device *device);
+static void qla4xxx_slave_destroy(struct scsi_device *sdev);
+
+static struct scsi_host_template qla4xxx_driver_template = {
+        .module                 = THIS_MODULE,
+        .name                   = DRIVER_NAME,
+        .proc_name              = DRIVER_NAME,
+        .queuecommand           = qla4xxx_queuecommand,
+
+        .eh_device_reset_handler = qla4xxx_eh_device_reset,
+        .eh_host_reset_handler  = qla4xxx_eh_host_reset,
+
+        .slave_configure        = qla4xxx_slave_configure,
+        .slave_alloc            = qla4xxx_slave_alloc,
+        .slave_destroy          = qla4xxx_slave_destroy,
+
+        .this_id                = -1,
+        .cmd_per_lun            = 3,
+        .use_clustering         = ENABLE_CLUSTERING,
+        .sg_tablesize           = SG_ALL,
+
+        .max_sectors            = 0xFFFF,
+};
+
+static struct iscsi_transport qla4xxx_iscsi_transport = {
+        .owner                  = THIS_MODULE,
+        .name                   = DRIVER_NAME,
+        .param_mask             = ISCSI_CONN_PORT |
+                                  ISCSI_CONN_ADDRESS |
+                                  ISCSI_TARGET_NAME |
+                                  ISCSI_TPGT,
+        .sessiondata_size       = sizeof(struct ddb_entry),
+        .host_template          = &qla4xxx_driver_template,
+
+        .tgt_dscvr              = qla4xxx_tgt_dscvr,
+        .get_conn_param         = qla4xxx_conn_get_param,
+        .get_session_param      = qla4xxx_sess_get_param,
+        .start_conn             = qla4xxx_conn_start,
+        .stop_conn              = qla4xxx_conn_stop,
+        .session_recovery_timedout = qla4xxx_recovery_timedout,
+};
+
+static struct scsi_transport_template *qla4xxx_scsi_transport;
+
+static void qla4xxx_recovery_timedout(struct iscsi_cls_session *session)
+{
+        struct ddb_entry *ddb_entry = session->dd_data;
+        struct scsi_qla_host *ha = ddb_entry->ha;
+
+        DEBUG2(printk("scsi%ld: %s: index [%d] port down retry count of (%d) "
+                      "secs exhausted, marking device DEAD.\n", ha->host_no,
+                      __func__, ddb_entry->fw_ddb_index,
+                      ha->port_down_retry_count));
+
+        atomic_set(&ddb_entry->state, DDB_STATE_DEAD);
+
+        DEBUG2(printk("scsi%ld: %s: scheduling dpc routine - dpc flags = "
+                      "0x%lx\n", ha->host_no, __func__, ha->dpc_flags));
+        queue_work(ha->dpc_thread, &ha->dpc_work);
+}
+
+static int qla4xxx_conn_start(struct iscsi_cls_conn *conn)
+{
+        struct iscsi_cls_session *session;
+        struct ddb_entry *ddb_entry;
+
+        session = iscsi_dev_to_session(conn->dev.parent);
+        ddb_entry = session->dd_data;
+
+        DEBUG2(printk("scsi%ld: %s: index [%d] starting conn\n",
+                      ddb_entry->ha->host_no, __func__,
+                      ddb_entry->fw_ddb_index));
+        iscsi_unblock_session(session);
+        return 0;
+}
+
+static void qla4xxx_conn_stop(struct iscsi_cls_conn *conn, int flag)
+{
+        struct iscsi_cls_session *session;
+        struct ddb_entry *ddb_entry;
+
+        session = iscsi_dev_to_session(conn->dev.parent);
+        ddb_entry = session->dd_data;
+
+        DEBUG2(printk("scsi%ld: %s: index [%d] stopping conn\n",
+                      ddb_entry->ha->host_no, __func__,
+                      ddb_entry->fw_ddb_index));
+        if (flag == STOP_CONN_RECOVER)
+                iscsi_block_session(session);
+        else
+                printk(KERN_ERR "iscsi: invalid stop flag %d\n", flag);
+}
+
+static int qla4xxx_sess_get_param(struct iscsi_cls_session *sess,
+                                  enum iscsi_param param, char *buf)
+{
+        struct ddb_entry *ddb_entry = sess->dd_data;
+        int len;
+
+        switch (param) {
+        case ISCSI_PARAM_TARGET_NAME:
+                len = snprintf(buf, PAGE_SIZE - 1, "%s\n",
+                               ddb_entry->iscsi_name);
+                break;
+        case ISCSI_PARAM_TPGT:
+                len = sprintf(buf, "%u\n", ddb_entry->tpgt);
+                break;
+        default:
+                return -ENOSYS;
+        }
+
+        return len;
+}
+
+static int qla4xxx_conn_get_param(struct iscsi_cls_conn *conn,
+                                  enum iscsi_param param, char *buf)
+{
+        struct iscsi_cls_session *session;
+        struct ddb_entry *ddb_entry;
+        int len;
+
+        session = iscsi_dev_to_session(conn->dev.parent);
+        ddb_entry = session->dd_data;
+
+        switch (param) {
+        case ISCSI_PARAM_CONN_PORT:
+                len = sprintf(buf, "%hu\n", ddb_entry->port);
+                break;
+        case ISCSI_PARAM_CONN_ADDRESS:
+                /* TODO: what are the ipv6 bits */
+                len = sprintf(buf, "%u.%u.%u.%u\n",
+                              NIPQUAD(ddb_entry->ip_addr));
+                break;
+        default:
+                return -ENOSYS;
+        }
+
+        return len;
+}
+
+static int qla4xxx_tgt_dscvr(enum iscsi_tgt_dscvr type, uint32_t host_no,
+                             uint32_t enable, struct sockaddr *dst_addr)
+{
+        struct scsi_qla_host *ha;
+        struct Scsi_Host *shost;
+        struct sockaddr_in *addr;
+        struct sockaddr_in6 *addr6;
+        int ret = 0;
+
+        shost = scsi_host_lookup(host_no);
+        if (IS_ERR(shost)) {
+                printk(KERN_ERR "Could not find host no %u\n", host_no);
+                return -ENODEV;
+        }
+
+        ha = (struct scsi_qla_host *) shost->hostdata;
+
+        switch (type) {
+        case ISCSI_TGT_DSCVR_SEND_TARGETS:
+                if (dst_addr->sa_family == AF_INET) {
+                        addr = (struct sockaddr_in *)dst_addr;
+                        if (qla4xxx_send_tgts(ha, (char *)&addr->sin_addr,
+                                              addr->sin_port) != QLA_SUCCESS)
+                                ret = -EIO;
+                } else if (dst_addr->sa_family == AF_INET6) {
+                        /*
+                         * TODO: fix qla4xxx_send_tgts
+                         */
+                        addr6 = (struct sockaddr_in6 *)dst_addr;
+                        if (qla4xxx_send_tgts(ha, (char *)&addr6->sin6_addr,
+                                              addr6->sin6_port) != QLA_SUCCESS)
+                                ret = -EIO;
+                } else
+                        ret = -ENOSYS;
+                break;
+        default:
+                ret = -ENOSYS;
+        }
+
+        scsi_host_put(shost);
+        return ret;
+}
+
+void qla4xxx_destroy_sess(struct ddb_entry *ddb_entry)
+{
+        if (!ddb_entry->sess)
+                return;
+
+        if (ddb_entry->conn) {
+                iscsi_if_destroy_session_done(ddb_entry->conn);
+                iscsi_destroy_conn(ddb_entry->conn);
+                iscsi_remove_session(ddb_entry->sess);
+        }
+        iscsi_free_session(ddb_entry->sess);
+}
+
+int qla4xxx_add_sess(struct ddb_entry *ddb_entry)
+{
+        int err;
+
+        err = iscsi_add_session(ddb_entry->sess, ddb_entry->fw_ddb_index);
+        if (err) {
+                DEBUG2(printk(KERN_ERR "Could not add session.\n"));
+                return err;
+        }
+
+        ddb_entry->conn = iscsi_create_conn(ddb_entry->sess, 0);
+        if (!ddb_entry->conn) {
+                iscsi_remove_session(ddb_entry->sess);
+                DEBUG2(printk(KERN_ERR "Could not add connection.\n"));
+                return -ENOMEM;
+        }
+
+        ddb_entry->sess->recovery_tmo = ddb_entry->ha->port_down_retry_count;
+        iscsi_if_create_session_done(ddb_entry->conn);
+        return 0;
+}
+
+struct ddb_entry *qla4xxx_alloc_sess(struct scsi_qla_host *ha)
+{
+        struct ddb_entry *ddb_entry;
+        struct iscsi_cls_session *sess;
+
+        sess = iscsi_alloc_session(ha->host, &qla4xxx_iscsi_transport);
+        if (!sess)
+                return NULL;
+
+        ddb_entry = sess->dd_data;
+        memset(ddb_entry, 0, sizeof(*ddb_entry));
+        ddb_entry->ha = ha;
+        ddb_entry->sess = sess;
+        return ddb_entry;
+}
+
+/*
+ * Timer routines
+ */
+
+static void qla4xxx_start_timer(struct scsi_qla_host *ha, void *func,
+                                unsigned long interval)
+{
+        DEBUG(printk("scsi: %s: Starting timer thread for adapter %d\n",
+                     __func__, ha->host->host_no));
+        init_timer(&ha->timer);
+        ha->timer.expires = jiffies + interval * HZ;
+        ha->timer.data = (unsigned long)ha;
+        ha->timer.function = (void (*)(unsigned long))func;
+        add_timer(&ha->timer);
+        ha->timer_active = 1;
+}
+
+static void qla4xxx_stop_timer(struct scsi_qla_host *ha)
+{
+        del_timer_sync(&ha->timer);
+        ha->timer_active = 0;
+}
+
+/***
+ * qla4xxx_mark_device_missing - mark a device as missing.
+ * @ha: Pointer to host adapter structure.
+ * @ddb_entry: Pointer to device database entry
+ *
+ * This routine marks a device missing and resets the relogin retry count.
+ **/
+void qla4xxx_mark_device_missing(struct scsi_qla_host *ha,
+                                 struct ddb_entry *ddb_entry)
+{
+        atomic_set(&ddb_entry->state, DDB_STATE_MISSING);
+        DEBUG3(printk("scsi%d:%d:%d: index [%d] marked MISSING\n",
+                      ha->host_no, ddb_entry->bus, ddb_entry->target,
+                      ddb_entry->fw_ddb_index));
+        iscsi_conn_error(ddb_entry->conn, ISCSI_ERR_CONN_FAILED);
+}
+
+static struct srb* qla4xxx_get_new_srb(struct scsi_qla_host *ha,
+                                       struct ddb_entry *ddb_entry,
+                                       struct scsi_cmnd *cmd,
+                                       void (*done)(struct scsi_cmnd *))
+{
+        struct srb *srb;
+
+        srb = mempool_alloc(ha->srb_mempool, GFP_ATOMIC);
+        if (!srb)
+                return srb;
+
+        atomic_set(&srb->ref_count, 1);
+        srb->ha = ha;
+        srb->ddb = ddb_entry;
+        srb->cmd = cmd;
+        srb->flags = 0;
+        cmd->SCp.ptr = (void *)srb;
+        cmd->scsi_done = done;
+
+        return srb;
+}
+
+static void qla4xxx_srb_free_dma(struct scsi_qla_host *ha, struct srb *srb)
+{
+        struct scsi_cmnd *cmd = srb->cmd;
+
+        if (srb->flags & SRB_DMA_VALID) {
+                if (cmd->use_sg) {
+                        pci_unmap_sg(ha->pdev, cmd->request_buffer,
+                                     cmd->use_sg, cmd->sc_data_direction);
+                } else if (cmd->request_bufflen) {
+                        pci_unmap_single(ha->pdev, srb->dma_handle,
+                                         cmd->request_bufflen,
+                                         cmd->sc_data_direction);
+                }
+                srb->flags &= ~SRB_DMA_VALID;
+        }
+        cmd->SCp.ptr = NULL;
+}
+
+void qla4xxx_srb_compl(struct scsi_qla_host *ha, struct srb *srb)
+{
+        struct scsi_cmnd *cmd = srb->cmd;
+
+        qla4xxx_srb_free_dma(ha, srb);
+
+        mempool_free(srb, ha->srb_mempool);
+
+        cmd->scsi_done(cmd);
+}
+
+/**
+ * qla4xxx_queuecommand - scsi layer issues scsi command to driver.
+ * @cmd: Pointer to Linux's SCSI command structure
+ * @done_fn: Function that the driver calls to notify the SCSI mid-layer
+ *      that the command has been processed.
+ *
+ * Remarks:
+ * This routine is invoked by Linux to send a SCSI command to the driver.
+ * The mid-level driver tries to ensure that queuecommand never gets
+ * invoked concurrently with itself or the interrupt handler (although
+ * the interrupt handler may call this routine as part of request-
+ * completion handling).   Unfortunely, it sometimes calls the scheduler
+ * in interrupt context which is a big NO! NO!.
+ **/
+static int qla4xxx_queuecommand(struct scsi_cmnd *cmd,
+                                void (*done)(struct scsi_cmnd *))
+{
+        struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
+        struct ddb_entry *ddb_entry = cmd->device->hostdata;
+        struct srb *srb;
+        int rval;
+
+        if (atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
+                if (atomic_read(&ddb_entry->state) == DDB_STATE_DEAD) {
+                        cmd->result = DID_NO_CONNECT << 16;
+                        goto qc_fail_command;
+                }
+                goto qc_host_busy;
+        }
+
+        spin_unlock_irq(ha->host->host_lock);
+
+        srb = qla4xxx_get_new_srb(ha, ddb_entry, cmd, done);
+        if (!srb)
+                goto qc_host_busy_lock;
+
+        rval = qla4xxx_send_command_to_isp(ha, srb);
+        if (rval != QLA_SUCCESS)
+                goto qc_host_busy_free_sp;
+
+        spin_lock_irq(ha->host->host_lock);
+        return 0;
+
+qc_host_busy_free_sp:
+        qla4xxx_srb_free_dma(ha, srb);
+        mempool_free(srb, ha->srb_mempool);
+
+qc_host_busy_lock:
+        spin_lock_irq(ha->host->host_lock);
+
+qc_host_busy:
+        return SCSI_MLQUEUE_HOST_BUSY;
+
+qc_fail_command:
+        done(cmd);
+
+        return 0;
+}
+
+/**
+ * qla4xxx_mem_free - frees memory allocated to adapter
+ * @ha: Pointer to host adapter structure.
+ *
+ * Frees memory previously allocated by qla4xxx_mem_alloc
+ **/
+static void qla4xxx_mem_free(struct scsi_qla_host *ha)
+{
+        if (ha->queues)
+                dma_free_coherent(&ha->pdev->dev, ha->queues_len, ha->queues,
+                                  ha->queues_dma);
+
+        ha->queues_len = 0;
+        ha->queues = NULL;
+        ha->queues_dma = 0;
+        ha->request_ring = NULL;
+        ha->request_dma = 0;
+        ha->response_ring = NULL;
+        ha->response_dma = 0;
+        ha->shadow_regs = NULL;
+        ha->shadow_regs_dma = 0;
+
+        /* Free srb pool. */
+        if (ha->srb_mempool)
+                mempool_destroy(ha->srb_mempool);
+
+        ha->srb_mempool = NULL;
+
+        /* release io space registers  */
+        if (ha->reg)
+                iounmap(ha->reg);
+        pci_release_regions(ha->pdev);
+}
+
+/**
+ * qla4xxx_mem_alloc - allocates memory for use by adapter.
+ * @ha: Pointer to host adapter structure
+ *
+ * Allocates DMA memory for request and response queues. Also allocates memory
+ * for srbs.
+ **/
+static int qla4xxx_mem_alloc(struct scsi_qla_host *ha)
+{
+        unsigned long align;
+
+        /* Allocate contiguous block of DMA memory for queues. */
+        ha->queues_len = ((REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
+                          (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE) +
+                          sizeof(struct shadow_regs) +
+                          MEM_ALIGN_VALUE +
+                          (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
+        ha->queues = dma_alloc_coherent(&ha->pdev->dev, ha->queues_len,
+                                        &ha->queues_dma, GFP_KERNEL);
+        if (ha->queues == NULL) {
+                dev_warn(&ha->pdev->dev,
+                        "Memory Allocation failed - queues.\n");
+
+                goto mem_alloc_error_exit;
+        }
+        memset(ha->queues, 0, ha->queues_len);
+
+        /*
+         * As per RISC alignment requirements -- the bus-address must be a
+         * multiple of the request-ring size (in bytes).
+         */
+        align = 0;
+        if ((unsigned long)ha->queues_dma & (MEM_ALIGN_VALUE - 1))
+                align = MEM_ALIGN_VALUE - ((unsigned long)ha->queues_dma &
+                                           (MEM_ALIGN_VALUE - 1));
+
+        /* Update request and response queue pointers. */
+        ha->request_dma = ha->queues_dma + align;
+        ha->request_ring = (struct queue_entry *) (ha->queues + align);
+        ha->response_dma = ha->queues_dma + align +
+                (REQUEST_QUEUE_DEPTH * QUEUE_SIZE);
+        ha->response_ring = (struct queue_entry *) (ha->queues + align +
+                                                    (REQUEST_QUEUE_DEPTH *
+                                                     QUEUE_SIZE));
+        ha->shadow_regs_dma = ha->queues_dma + align +
+                (REQUEST_QUEUE_DEPTH * QUEUE_SIZE) +
+                (RESPONSE_QUEUE_DEPTH * QUEUE_SIZE);
+        ha->shadow_regs = (struct shadow_regs *) (ha->queues + align +
+                                                  (REQUEST_QUEUE_DEPTH *
+                                                   QUEUE_SIZE) +
+                                                  (RESPONSE_QUEUE_DEPTH *
+                                                   QUEUE_SIZE));
+
+        /* Allocate memory for srb pool. */
+        ha->srb_mempool = mempool_create(SRB_MIN_REQ, mempool_alloc_slab,
+                                         mempool_free_slab, srb_cachep);
+        if (ha->srb_mempool == NULL) {
+                dev_warn(&ha->pdev->dev,
+                        "Memory Allocation failed - SRB Pool.\n");
+
+                goto mem_alloc_error_exit;
+        }
+
+        return QLA_SUCCESS;
+
+mem_alloc_error_exit:
+        qla4xxx_mem_free(ha);
+        return QLA_ERROR;
+}
+
+/**
+ * qla4xxx_timer - checks every second for work to do.
+ * @ha: Pointer to host adapter structure.
+ **/
+static void qla4xxx_timer(struct scsi_qla_host *ha)
+{
+        struct ddb_entry *ddb_entry, *dtemp;
+        int start_dpc = 0;
+
+        /* Search for relogin's to time-out and port down retry. */
+        list_for_each_entry_safe(ddb_entry, dtemp, &ha->ddb_list, list) {
+                /* Count down time between sending relogins */
+                if (adapter_up(ha) &&
+                    !test_bit(DF_RELOGIN, &ddb_entry->flags) &&
+                    atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE) {
+                        if (atomic_read(&ddb_entry->retry_relogin_timer) !=
+                            INVALID_ENTRY) {
+                                if (atomic_read(&ddb_entry->retry_relogin_timer)
+                                                == 0) {
+                                        atomic_set(&ddb_entry->
+                                                retry_relogin_timer,
+                                                INVALID_ENTRY);
+                                        set_bit(DPC_RELOGIN_DEVICE,
+                                                &ha->dpc_flags);
+                                        set_bit(DF_RELOGIN, &ddb_entry->flags);
+                                        DEBUG2(printk("scsi%ld: %s: index [%d]"
+                                                      " login device\n",
+                                                      ha->host_no, __func__,
+                                                      ddb_entry->fw_ddb_index));
+                                } else
+                                        atomic_dec(&ddb_entry->
+                                                        retry_relogin_timer);
+                        }
+                }
+
+                /* Wait for relogin to timeout */
+                if (atomic_read(&ddb_entry->relogin_timer) &&
+                    (atomic_dec_and_test(&ddb_entry->relogin_timer) != 0)) {
+                        /*
+                         * If the relogin times out and the device is
+                         * still NOT ONLINE then try and relogin again.
+                         */
+                        if (atomic_read(&ddb_entry->state) !=
+                            DDB_STATE_ONLINE &&
+                            ddb_entry->fw_ddb_device_state ==
+                            DDB_DS_SESSION_FAILED) {
+                                /* Reset retry relogin timer */
+                                atomic_inc(&ddb_entry->relogin_retry_count);
+                                DEBUG2(printk("scsi%ld: index[%d] relogin"
+                                              " timed out-retrying"
+                                              " relogin (%d)\n",
+                                              ha->host_no,
+                                              ddb_entry->fw_ddb_index,
+                                              atomic_read(&ddb_entry->
+                                                          relogin_retry_count))
+                                        );
+                                start_dpc++;
+                                DEBUG(printk("scsi%ld:%d:%d: index [%d] "
+                                             "initate relogin after"
+                                             " %d seconds\n",
+                                             ha->host_no, ddb_entry->bus,
+                                             ddb_entry->target,
+                                             ddb_entry->fw_ddb_index,
+                                             ddb_entry->default_time2wait + 4)
+                                        );
+
+                                atomic_set(&ddb_entry->retry_relogin_timer,
+                                           ddb_entry->default_time2wait + 4);
+                        }
+                }
+        }
+
+        /* Check for heartbeat interval. */
+        if (ha->firmware_options & FWOPT_HEARTBEAT_ENABLE &&
+            ha->heartbeat_interval != 0) {
+                ha->seconds_since_last_heartbeat++;
+                if (ha->seconds_since_last_heartbeat >
+                    ha->heartbeat_interval + 2)
+                        set_bit(DPC_RESET_HA, &ha->dpc_flags);
+        }
+
+
+        /* Wakeup the dpc routine for this adapter, if needed. */
+        if ((start_dpc ||
+             test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
+             test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags) ||
+             test_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags) ||
+             test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags) ||
+             test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
+             test_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags) ||
+             test_bit(DPC_AEN, &ha->dpc_flags)) &&
+             ha->dpc_thread) {
+                DEBUG2(printk("scsi%ld: %s: scheduling dpc routine"
+                              " - dpc flags = 0x%lx\n",
+                              ha->host_no, __func__, ha->dpc_flags));
+                queue_work(ha->dpc_thread, &ha->dpc_work);
+        }
+
+        /* Reschedule timer thread to call us back in one second */
+        mod_timer(&ha->timer, jiffies + HZ);
+
+        DEBUG2(ha->seconds_since_last_intr++);
+}
+
+/**
+ * qla4xxx_cmd_wait - waits for all outstanding commands to complete
+ * @ha: Pointer to host adapter structure.
+ *
+ * This routine stalls the driver until all outstanding commands are returned.
+ * Caller must release the Hardware Lock prior to calling this routine.
+ **/
+static int qla4xxx_cmd_wait(struct scsi_qla_host *ha)
+{
+        uint32_t index = 0;
+        int stat = QLA_SUCCESS;
+        unsigned long flags;
+        struct scsi_cmnd *cmd;
+        int wait_cnt = WAIT_CMD_TOV;    /*
+                                         * Initialized for 30 seconds as we
+                                         * expect all commands to retuned
+                                         * ASAP.
+                                         */
+
+        while (wait_cnt) {
+                spin_lock_irqsave(&ha->hardware_lock, flags);
+                /* Find a command that hasn't completed. */
+                for (index = 0; index < ha->host->can_queue; index++) {
+                        cmd = scsi_host_find_tag(ha->host, index);
+                        if (cmd != NULL)
+                                break;
+                }
+                spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+                /* If No Commands are pending, wait is complete */
+                if (index == ha->host->can_queue) {
+                        break;
+                }
+
+                /* If we timed out on waiting for commands to come back
+                 * return ERROR.
+                 */
+                wait_cnt--;
+                if (wait_cnt == 0)
+                        stat = QLA_ERROR;
+                else {
+                        msleep(1000);
+                }
+        }                       /* End of While (wait_cnt) */
+
+        return stat;
+}
+
+/**
+ * qla4010_soft_reset - performs soft reset.
+ * @ha: Pointer to host adapter structure.
+ **/
+static int qla4010_soft_reset(struct scsi_qla_host *ha)
+{
+        uint32_t max_wait_time;
+        unsigned long flags = 0;
+        int status = QLA_ERROR;
+        uint32_t ctrl_status;
+
+        spin_lock_irqsave(&ha->hardware_lock, flags);
+
+        /*
+         * If the SCSI Reset Interrupt bit is set, clear it.
+         * Otherwise, the Soft Reset won't work.
+         */
+        ctrl_status = readw(&ha->reg->ctrl_status);
+        if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0)
+                writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
+
+        /* Issue Soft Reset */
+        writel(set_rmask(CSR_SOFT_RESET), &ha->reg->ctrl_status);
+        readl(&ha->reg->ctrl_status);
+
+        spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+        /* Wait until the Network Reset Intr bit is cleared */
+        max_wait_time = RESET_INTR_TOV;
+        do {
+                spin_lock_irqsave(&ha->hardware_lock, flags);
+                ctrl_status = readw(&ha->reg->ctrl_status);
+                spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+                if ((ctrl_status & CSR_NET_RESET_INTR) == 0)
+                        break;
+
+                msleep(1000);
+        } while ((--max_wait_time));
+
+        if ((ctrl_status & CSR_NET_RESET_INTR) != 0) {
+                DEBUG2(printk(KERN_WARNING
+                              "scsi%ld: Network Reset Intr not cleared by "
+                              "Network function, clearing it now!\n",
+                              ha->host_no));
+                spin_lock_irqsave(&ha->hardware_lock, flags);
+                writel(set_rmask(CSR_NET_RESET_INTR), &ha->reg->ctrl_status);
+                readl(&ha->reg->ctrl_status);
+                spin_unlock_irqrestore(&ha->hardware_lock, flags);
+        }
+
+        /* Wait until the firmware tells us the Soft Reset is done */
+        max_wait_time = SOFT_RESET_TOV;
+        do {
+                spin_lock_irqsave(&ha->hardware_lock, flags);
+                ctrl_status = readw(&ha->reg->ctrl_status);
+                spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+                if ((ctrl_status & CSR_SOFT_RESET) == 0) {
+                        status = QLA_SUCCESS;
+                        break;
+                }
+
+                msleep(1000);
+        } while ((--max_wait_time));
+
+        /*
+         * Also, make sure that the SCSI Reset Interrupt bit has been cleared
+         * after the soft reset has taken place.
+         */
+        spin_lock_irqsave(&ha->hardware_lock, flags);
+        ctrl_status = readw(&ha->reg->ctrl_status);
+        if ((ctrl_status & CSR_SCSI_RESET_INTR) != 0) {
+                writel(set_rmask(CSR_SCSI_RESET_INTR), &ha->reg->ctrl_status);
+                readl(&ha->reg->ctrl_status);
+        }
+        spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+        /* If soft reset fails then most probably the bios on other
+         * function is also enabled.
+         * Since the initialization is sequential the other fn
+         * wont be able to acknowledge the soft reset.
+         * Issue a force soft reset to workaround this scenario.
+         */
+        if (max_wait_time == 0) {
+                /* Issue Force Soft Reset */
+                spin_lock_irqsave(&ha->hardware_lock, flags);
+                writel(set_rmask(CSR_FORCE_SOFT_RESET), &ha->reg->ctrl_status);
+                readl(&ha->reg->ctrl_status);
+                spin_unlock_irqrestore(&ha->hardware_lock, flags);
+                /* Wait until the firmware tells us the Soft Reset is done */
+                max_wait_time = SOFT_RESET_TOV;
+                do {
+                        spin_lock_irqsave(&ha->hardware_lock, flags);
+                        ctrl_status = readw(&ha->reg->ctrl_status);
+                        spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+                        if ((ctrl_status & CSR_FORCE_SOFT_RESET) == 0) {
+                                status = QLA_SUCCESS;
+                                break;
+                        }
+
+                        msleep(1000);
+                } while ((--max_wait_time));
+        }
+
+        return status;
+}
+
+/**
+ * qla4xxx_topcat_reset - performs hard reset of TopCat Chip.
+ * @ha: Pointer to host adapter structure.
+ **/
+static int qla4xxx_topcat_reset(struct scsi_qla_host *ha)
+{
+        unsigned long flags;
+
+        ql4xxx_lock_nvram(ha);
+        spin_lock_irqsave(&ha->hardware_lock, flags);
+        writel(set_rmask(GPOR_TOPCAT_RESET), isp_gp_out(ha));
+        readl(isp_gp_out(ha));
+        mdelay(1);
+
+        writel(clr_rmask(GPOR_TOPCAT_RESET), isp_gp_out(ha));
+        readl(isp_gp_out(ha));
+        spin_unlock_irqrestore(&ha->hardware_lock, flags);
+        mdelay(2523);
+
+        ql4xxx_unlock_nvram(ha);
+        return QLA_SUCCESS;
+}
+
+/**
+ * qla4xxx_flush_active_srbs - returns all outstanding i/o requests to O.S.
+ * @ha: Pointer to host adapter structure.
+ *
+ * This routine is called just prior to a HARD RESET to return all
+ * outstanding commands back to the Operating System.
+ * Caller should make sure that the following locks are released
+ * before this calling routine: Hardware lock, and io_request_lock.
+ **/
+static void qla4xxx_flush_active_srbs(struct scsi_qla_host *ha)
+{
+        struct srb *srb;
+        int i;
+        unsigned long flags;
+
+        spin_lock_irqsave(&ha->hardware_lock, flags);
+        for (i = 0; i < ha->host->can_queue; i++) {
+                srb = qla4xxx_del_from_active_array(ha, i);
+                if (srb != NULL) {
+                        srb->cmd->result = DID_RESET << 16;
+                        qla4xxx_srb_compl(ha, srb);
+                }
+        }
+        spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+}
+
+/**
+ * qla4xxx_hard_reset - performs HBA Hard Reset
+ * @ha: Pointer to host adapter structure.
+ **/
+static int qla4xxx_hard_reset(struct scsi_qla_host *ha)
+{
+        /* The QLA4010 really doesn't have an equivalent to a hard reset */
+        qla4xxx_flush_active_srbs(ha);
+        if (test_bit(AF_TOPCAT_CHIP_PRESENT, &ha->flags)) {
+                int status = QLA_ERROR;
+
+                if ((qla4010_soft_reset(ha) == QLA_SUCCESS) &&
+                    (qla4xxx_topcat_reset(ha) == QLA_SUCCESS) &&
+                    (qla4010_soft_reset(ha) == QLA_SUCCESS))
+                        status = QLA_SUCCESS;
+                return status;
+        } else
+                return qla4010_soft_reset(ha);
+}
+
+/**
+ * qla4xxx_recover_adapter - recovers adapter after a fatal error
+ * @ha: Pointer to host adapter structure.
+ * @renew_ddb_list: Indicates what to do with the adapter's ddb list
+ *      after adapter recovery has completed.
+ *      0=preserve ddb list, 1=destroy and rebuild ddb list
+ **/
+static int qla4xxx_recover_adapter(struct scsi_qla_host *ha,
+                                uint8_t renew_ddb_list)
+{
+        int status;
+
+        /* Stall incoming I/O until we are done */
+        clear_bit(AF_ONLINE, &ha->flags);
+        DEBUG2(printk("scsi%ld: %s calling qla4xxx_cmd_wait\n", ha->host_no,
+                      __func__));
+
+        /* Wait for outstanding commands to complete.
+         * Stalls the driver for max 30 secs
+         */
+        status = qla4xxx_cmd_wait(ha);
+
+        qla4xxx_disable_intrs(ha);
+
+        /* Flush any pending ddb changed AENs */
+        qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
+
+        /* Reset the firmware.  If successful, function
+         * returns with ISP interrupts enabled.
+         */
+        if (status == QLA_SUCCESS) {
+                DEBUG2(printk("scsi%ld: %s - Performing soft reset..\n",
+                              ha->host_no, __func__));
+                status = qla4xxx_soft_reset(ha);
+        }
+        /* FIXMEkaren: Do we want to keep interrupts enabled and process
+           AENs after soft reset */
+
+        /* If firmware (SOFT) reset failed, or if all outstanding
+         * commands have not returned, then do a HARD reset.
+         */
+        if (status == QLA_ERROR) {
+                DEBUG2(printk("scsi%ld: %s - Performing hard reset..\n",
+                              ha->host_no, __func__));
+                status = qla4xxx_hard_reset(ha);
+        }
+
+        /* Flush any pending ddb changed AENs */
+        qla4xxx_process_aen(ha, FLUSH_DDB_CHANGED_AENS);
+
+        /* Re-initialize firmware. If successful, function returns
+         * with ISP interrupts enabled */
+        if (status == QLA_SUCCESS) {
+                DEBUG2(printk("scsi%ld: %s - Initializing adapter..\n",
+                              ha->host_no, __func__));
+
+                /* If successful, AF_ONLINE flag set in
+                 * qla4xxx_initialize_adapter */
+                status = qla4xxx_initialize_adapter(ha, renew_ddb_list);
+        }
+
+        /* Failed adapter initialization?
+         * Retry reset_ha only if invoked via DPC (DPC_RESET_HA) */
+        if ((test_bit(AF_ONLINE, &ha->flags) == 0) &&
+            (test_bit(DPC_RESET_HA, &ha->dpc_flags))) {
+                /* Adapter initialization failed, see if we can retry
+                 * resetting the ha */
+                if (!test_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags)) {
+                        ha->retry_reset_ha_cnt = MAX_RESET_HA_RETRIES;
+                        DEBUG2(printk("scsi%ld: recover adapter - retrying "
+                                      "(%d) more times\n", ha->host_no,
+                                      ha->retry_reset_ha_cnt));
+                        set_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
+                        status = QLA_ERROR;
+                } else {
+                        if (ha->retry_reset_ha_cnt > 0) {
+                                /* Schedule another Reset HA--DPC will retry */
+                                ha->retry_reset_ha_cnt--;
+                                DEBUG2(printk("scsi%ld: recover adapter - "
+                                              "retry remaining %d\n",
+                                              ha->host_no,
+                                              ha->retry_reset_ha_cnt));
+                                status = QLA_ERROR;
+                        }
+
+                        if (ha->retry_reset_ha_cnt == 0) {
+                                /* Recover adapter retries have been exhausted.
+                                 * Adapter DEAD */
+                                DEBUG2(printk("scsi%ld: recover adapter "
+                                              "failed - board disabled\n",
+                                              ha->host_no));
+                                qla4xxx_flush_active_srbs(ha);
+                                clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
+                                clear_bit(DPC_RESET_HA, &ha->dpc_flags);
+                                clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST,
+                                          &ha->dpc_flags);
+                                status = QLA_ERROR;
+                        }
+                }
+        } else {
+                clear_bit(DPC_RESET_HA, &ha->dpc_flags);
+                clear_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags);
+                clear_bit(DPC_RETRY_RESET_HA, &ha->dpc_flags);
+        }
+
+        ha->adapter_error_count++;
+
+        if (status == QLA_SUCCESS)
+                qla4xxx_enable_intrs(ha);
+
+        DEBUG2(printk("scsi%ld: recover adapter .. DONE\n", ha->host_no));
+        return status;
+}
+
+/**
+ * qla4xxx_do_dpc - dpc routine
+ * @data: in our case pointer to adapter structure
+ *
+ * This routine is a task that is schedule by the interrupt handler
+ * to perform the background processing for interrupts.  We put it
+ * on a task queue that is consumed whenever the scheduler runs; that's
+ * so you can do anything (i.e. put the process to sleep etc).  In fact,
+ * the mid-level tries to sleep when it reaches the driver threshold
+ * "host->can_queue". This can cause a panic if we were in our interrupt code.
+ **/
+static void qla4xxx_do_dpc(void *data)
+{
+        struct scsi_qla_host *ha = (struct scsi_qla_host *) data;
+        struct ddb_entry *ddb_entry, *dtemp;
+
+        DEBUG2(printk("scsi%ld: %s: DPC handler waking up.\n",
+                      ha->host_no, __func__));
+
+        DEBUG2(printk("scsi%ld: %s: ha->flags = 0x%08lx\n",
+                      ha->host_no, __func__, ha->flags));
+        DEBUG2(printk("scsi%ld: %s: ha->dpc_flags = 0x%08lx\n",
+                      ha->host_no, __func__, ha->dpc_flags));
+
+        /* Initialization not yet finished. Don't do anything yet. */
+        if (!test_bit(AF_INIT_DONE, &ha->flags))
+                return;
+
+        if (adapter_up(ha) ||
+            test_bit(DPC_RESET_HA, &ha->dpc_flags) ||
+            test_bit(DPC_RESET_HA_INTR, &ha->dpc_flags) ||
+            test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags)) {
+                if (test_bit(DPC_RESET_HA_DESTROY_DDB_LIST, &ha->dpc_flags))
+                        /*
+                         * dg 09/23 Never initialize ddb list
+                         * once we up and running
+                         * qla4xxx_recover_adapter(ha,
+                         *    REBUILD_DDB_LIST);
+                         */
+                        qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);
+
+                if (test_bit(DPC_RESET_HA, &ha->dpc_flags))
+                        qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST);
+
+                if (test_and_clear_bit(DPC_RESET_HA_INTR, &ha->dpc_flags)) {
+                        uint8_t wait_time = RESET_INTR_TOV;
+                        unsigned long flags = 0;
+
+                        qla4xxx_flush_active_srbs(ha);
+
+                        spin_lock_irqsave(&ha->hardware_lock, flags);
+                        while ((readw(&ha->reg->ctrl_status) &
+                                (CSR_SOFT_RESET | CSR_FORCE_SOFT_RESET)) != 0) {
+                                if (--wait_time == 0)
+                                        break;
+
+                                spin_unlock_irqrestore(&ha->hardware_lock,
+                                                       flags);
+
+                                msleep(1000);
+
+                                spin_lock_irqsave(&ha->hardware_lock, flags);
+                        }
+                        spin_unlock_irqrestore(&ha->hardware_lock, flags);
+
+                        if (wait_time == 0)
+                                DEBUG2(printk("scsi%ld: %s: SR|FSR "
+                                              "bit not cleared-- resetting\n",
+                                              ha->host_no, __func__));
+                }
+        }
+
+        /* ---- process AEN? --- */
+        if (test_and_clear_bit(DPC_AEN, &ha->dpc_flags))
+                qla4xxx_process_aen(ha, PROCESS_ALL_AENS);
+
+        /* ---- Get DHCP IP Address? --- */
+        if (test_and_clear_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags))
+                qla4xxx_get_dhcp_ip_address(ha);
+
+        /* ---- relogin device? --- */
+        if (adapter_up(ha) &&
+            test_and_clear_bit(DPC_RELOGIN_DEVICE, &ha->dpc_flags)) {
+                list_for_each_entry_safe(ddb_entry, dtemp,
+                                         &ha->ddb_list, list) {
+                        if (test_and_clear_bit(DF_RELOGIN, &ddb_entry->flags) &&
+                            atomic_read(&ddb_entry->state) != DDB_STATE_ONLINE)
+                                qla4xxx_relogin_device(ha, ddb_entry);
+
+                        /*
+                         * If mbx cmd times out there is no point
+                         * in continuing further.
+                         * With large no of targets this can hang
+                         * the system.
+                         */
+                        if (test_bit(DPC_RESET_HA, &ha->dpc_flags)) {
+                                printk(KERN_WARNING "scsi%ld: %s: "
+                                       "need to reset hba\n",
+                                       ha->host_no, __func__);
+                                break;
+                        }
+                }
+        }
+}
+
+/**
+ * qla4xxx_free_adapter - release the adapter
+ * @ha: pointer to adapter structure
+ **/
+static void qla4xxx_free_adapter(struct scsi_qla_host *ha)
+{
+
+        if (test_bit(AF_INTERRUPTS_ON, &ha->flags)) {
+                /* Turn-off interrupts on the card. */
+                qla4xxx_disable_intrs(ha);
+        }
+
+        /* Kill the kernel thread for this host */
+        if (ha->dpc_thread)
+                destroy_workqueue(ha->dpc_thread);
+
+        /* Issue Soft Reset to put firmware in unknown state */
+        qla4xxx_soft_reset(ha);
+
+        /* Remove timer thread, if present */
+        if (ha->timer_active)
+                qla4xxx_stop_timer(ha);
+
+        /* free extra memory */
+        qla4xxx_mem_free(ha);
+
+        /* Detach interrupts */
+        if (test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
+                free_irq(ha->pdev->irq, ha);
+
+        pci_disable_device(ha->pdev);
+
+}
+
+/***
+ * qla4xxx_iospace_config - maps registers
+ * @ha: pointer to adapter structure
+ *
+ * This routines maps HBA's registers from the pci address space
+ * into the kernel virtual address space for memory mapped i/o.
+ **/
+static int qla4xxx_iospace_config(struct scsi_qla_host *ha)
+{
+        unsigned long pio, pio_len, pio_flags;
+        unsigned long mmio, mmio_len, mmio_flags;
+
+        pio = pci_resource_start(ha->pdev, 0);
+        pio_len = pci_resource_len(ha->pdev, 0);
+        pio_flags = pci_resource_flags(ha->pdev, 0);
+        if (pio_flags & IORESOURCE_IO) {
+                if (pio_len < MIN_IOBASE_LEN) {
+                        dev_warn(&ha->pdev->dev,
+                                "Invalid PCI I/O region size\n");
+                        pio = 0;
+                }
+        } else {
+                dev_warn(&ha->pdev->dev, "region #0 not a PIO resource\n");
+                pio = 0;
+        }
+
+        /* Use MMIO operations for all accesses. */
+        mmio = pci_resource_start(ha->pdev, 1);
+        mmio_len = pci_resource_len(ha->pdev, 1);
+        mmio_flags = pci_resource_flags(ha->pdev, 1);
+
+        if (!(mmio_flags & IORESOURCE_MEM)) {
+                dev_err(&ha->pdev->dev,
+                        "region #0 not an MMIO resource, aborting\n");
+
+                goto iospace_error_exit;
+        }
+        if (mmio_len < MIN_IOBASE_LEN) {
+                dev_err(&ha->pdev->dev,
+                        "Invalid PCI mem region size, aborting\n");
+                goto iospace_error_exit;
+        }
+
+        if (pci_request_regions(ha->pdev, DRIVER_NAME)) {
+                dev_warn(&ha->pdev->dev,
+                        "Failed to reserve PIO/MMIO regions\n");
+
+                goto iospace_error_exit;
+        }
+
+        ha->pio_address = pio;
+        ha->pio_length = pio_len;
+        ha->reg = ioremap(mmio, MIN_IOBASE_LEN);
+        if (!ha->reg) {
+                dev_err(&ha->pdev->dev,
+                        "cannot remap MMIO, aborting\n");
+
+                goto iospace_error_exit;
+        }
+
+        return 0;
+
+iospace_error_exit:
+        return -ENOMEM;
+}
+
+/**
+ * qla4xxx_probe_adapter - callback function to probe HBA
+ * @pdev: pointer to pci_dev structure
+ * @pci_device_id: pointer to pci_device entry
+ *
+ * This routine will probe for Qlogic 4xxx iSCSI host adapters.
+ * It returns zero if successful. It also initializes all data necessary for
+ * the driver.
+ **/
+static int __devinit qla4xxx_probe_adapter(struct pci_dev *pdev,
+                                           const struct pci_device_id *ent)
+{
+        int ret = -ENODEV, status;
+        struct Scsi_Host *host;
+        struct scsi_qla_host *ha;
+        struct ddb_entry *ddb_entry, *ddbtemp;
+        uint8_t init_retry_count = 0;
+        char buf[34];
+
+        if (pci_enable_device(pdev))
+                return -1;
+
+        host = scsi_host_alloc(&qla4xxx_driver_template, sizeof(*ha));
+        if (host == NULL) {
+                printk(KERN_WARNING
+                       "qla4xxx: Couldn't allocate host from scsi layer!\n");
+                goto probe_disable_device;
+        }
+
+        /* Clear our data area */
+        ha = (struct scsi_qla_host *) host->hostdata;
+        memset(ha, 0, sizeof(*ha));
+
+        /* Save the information from PCI BIOS.  */
+        ha->pdev = pdev;
+        ha->host = host;
+        ha->host_no = host->host_no;
+
+        /* Configure PCI I/O space. */
+        ret = qla4xxx_iospace_config(ha);
+        if (ret)
+                goto probe_failed;
+
+        dev_info(&ha->pdev->dev, "Found an ISP%04x, irq %d, iobase 0x%p\n",
+                   pdev->device, pdev->irq, ha->reg);
+
+        qla4xxx_config_dma_addressing(ha);
+
+        /* Initialize lists and spinlocks. */
+        INIT_LIST_HEAD(&ha->ddb_list);
+        INIT_LIST_HEAD(&ha->free_srb_q);
+
+        mutex_init(&ha->mbox_sem);
+        init_waitqueue_head(&ha->mailbox_wait_queue);
+
+        spin_lock_init(&ha->hardware_lock);
+        spin_lock_init(&ha->list_lock);
+
+        /* Allocate dma buffers */
+        if (qla4xxx_mem_alloc(ha)) {
+                dev_warn(&ha->pdev->dev,
+                           "[ERROR] Failed to allocate memory for adapter\n");
+
+                ret = -ENOMEM;
+                goto probe_failed;
+        }
+
+        /*
+         * Initialize the Host adapter request/response queues and
+         * firmware
+         * NOTE: interrupts enabled upon successful completion
+         */
+        status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
+        while (status == QLA_ERROR && init_retry_count++ < MAX_INIT_RETRIES) {
+                DEBUG2(printk("scsi: %s: retrying adapter initialization "
+                              "(%d)\n", __func__, init_retry_count));
+                qla4xxx_soft_reset(ha);
+                status = qla4xxx_initialize_adapter(ha, REBUILD_DDB_LIST);
+        }
+        if (status == QLA_ERROR) {
+                dev_warn(&ha->pdev->dev, "Failed to initialize adapter\n");
+
+                ret = -ENODEV;
+                goto probe_failed;
+        }
+
+        host->cmd_per_lun = 3;
+        host->max_channel = 0;
+        host->max_lun = MAX_LUNS - 1;
+        host->max_id = MAX_TARGETS;
+        host->max_cmd_len = IOCB_MAX_CDB_LEN;
+        host->can_queue = MAX_SRBS ;
+        host->transportt = qla4xxx_scsi_transport;
+
+        ret = scsi_init_shared_tag_map(host, MAX_SRBS);
+        if (ret) {
+                dev_warn(&ha->pdev->dev, "scsi_init_shared_tag_map failed");
+                goto probe_failed;
+        }
+
+        /* Startup the kernel thread for this host adapter. */
+        DEBUG2(printk("scsi: %s: Starting kernel thread for "
+                      "qla4xxx_dpc\n", __func__));
+        sprintf(buf, "qla4xxx_%lu_dpc", ha->host_no);
+        ha->dpc_thread = create_singlethread_workqueue(buf);
+        if (!ha->dpc_thread) {
+                dev_warn(&ha->pdev->dev, "Unable to start DPC thread!\n");
+                ret = -ENODEV;
+                goto probe_failed;
+        }
+        INIT_WORK(&ha->dpc_work, qla4xxx_do_dpc, ha);
+
+        ret = request_irq(pdev->irq, qla4xxx_intr_handler,
+                          SA_INTERRUPT|SA_SHIRQ, "qla4xxx", ha);
+        if (ret) {
+                dev_warn(&ha->pdev->dev, "Failed to reserve interrupt %d"
+                        " already in use.\n", pdev->irq);
+                goto probe_failed;
+        }
+        set_bit(AF_IRQ_ATTACHED, &ha->flags);
+        host->irq = pdev->irq;
+        DEBUG(printk("scsi%d: irq %d attached\n", ha->host_no, ha->pdev->irq));
+
+        qla4xxx_enable_intrs(ha);
+
+        /* Start timer thread. */
+        qla4xxx_start_timer(ha, qla4xxx_timer, 1);
+
+        set_bit(AF_INIT_DONE, &ha->flags);
+
+        pci_set_drvdata(pdev, ha);
+
+        ret = scsi_add_host(host, &pdev->dev);
+        if (ret)
+                goto probe_failed;
+
+        /* Update transport device information for all devices. */
+        list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
+                if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
+                        if (qla4xxx_add_sess(ddb_entry))
+                                goto remove_host;
+        }
+
+        printk(KERN_INFO
+               " QLogic iSCSI HBA Driver version: %s\n"
+               "  QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
+               qla4xxx_version_str, ha->pdev->device, pci_name(ha->pdev),
+               ha->host_no, ha->firmware_version[0], ha->firmware_version[1],
+               ha->patch_number, ha->build_number);
+
+        return 0;
+
+remove_host:
+        qla4xxx_free_ddb_list(ha);
+        scsi_remove_host(host);
+
+probe_failed:
+        qla4xxx_free_adapter(ha);
+        scsi_host_put(ha->host);
+
+probe_disable_device:
+        pci_disable_device(pdev);
+
+        return ret;
+}
+
+/**
+ * qla4xxx_remove_adapter - calback function to remove adapter.
+ * @pci_dev: PCI device pointer
+ **/
+static void __devexit qla4xxx_remove_adapter(struct pci_dev *pdev)
+{
+        struct scsi_qla_host *ha;
+
+        ha = pci_get_drvdata(pdev);
+
+        /* remove devs from iscsi_sessions to scsi_devices */
+        qla4xxx_free_ddb_list(ha);
+
+        scsi_remove_host(ha->host);
+
+        qla4xxx_free_adapter(ha);
+
+        scsi_host_put(ha->host);
+
+        pci_set_drvdata(pdev, NULL);
+}
+
+/**
+ * qla4xxx_config_dma_addressing() - Configure OS DMA addressing method.
+ * @ha: HA context
+ *
+ * At exit, the @ha's flags.enable_64bit_addressing set to indicated
+ * supported addressing method.
+ */
+void qla4xxx_config_dma_addressing(struct scsi_qla_host *ha)
+{
+        int retval;
+
+        /* Update our PCI device dma_mask for full 64 bit mask */
+        if (pci_set_dma_mask(ha->pdev, DMA_64BIT_MASK) == 0) {
+                if (pci_set_consistent_dma_mask(ha->pdev, DMA_64BIT_MASK)) {
+                        dev_dbg(&ha->pdev->dev,
+                                  "Failed to set 64 bit PCI consistent mask; "
+                                   "using 32 bit.\n");
+                        retval = pci_set_consistent_dma_mask(ha->pdev,
+                                                             DMA_32BIT_MASK);
+                }
+        } else
+                retval = pci_set_dma_mask(ha->pdev, DMA_32BIT_MASK);
+}
+
+static int qla4xxx_slave_alloc(struct scsi_device *sdev)
+{
+        struct iscsi_cls_session *sess = starget_to_session(sdev->sdev_target);
+        struct ddb_entry *ddb = sess->dd_data;
+
+        sdev->hostdata = ddb;
+        sdev->tagged_supported = 1;
+        scsi_activate_tcq(sdev, sdev->host->can_queue);
+        return 0;
+}
+
+static int qla4xxx_slave_configure(struct scsi_device *sdev)
+{
+        sdev->tagged_supported = 1;
+        return 0;
+}
+
+static void qla4xxx_slave_destroy(struct scsi_device *sdev)
+{
+        scsi_deactivate_tcq(sdev, 1);
+}
+
+/**
+ * qla4xxx_del_from_active_array - returns an active srb
+ * @ha: Pointer to host adapter structure.
+ * @index: index into to the active_array
+ *
+ * This routine removes and returns the srb at the specified index
+ **/
+struct srb * qla4xxx_del_from_active_array(struct scsi_qla_host *ha, uint32_t index)
+{
+        struct srb *srb = NULL;
+        struct scsi_cmnd *cmd;
+
+        if (!(cmd = scsi_host_find_tag(ha->host, index)))
+                return srb;
+
+        if (!(srb = (struct srb *)cmd->host_scribble))
+                return srb;
+
+        /* update counters */
+        if (srb->flags & SRB_DMA_VALID) {
+                ha->req_q_count += srb->iocb_cnt;
+                ha->iocb_cnt -= srb->iocb_cnt;
+                if (srb->cmd)
+                        srb->cmd->host_scribble = NULL;
+        }
+        return srb;
+}
+
+/**
+ * qla4xxx_soft_reset - performs a SOFT RESET of hba.
+ * @ha: Pointer to host adapter structure.
+ **/
+int qla4xxx_soft_reset(struct scsi_qla_host *ha)
+{
+
+        DEBUG2(printk(KERN_WARNING "scsi%ld: %s: chip reset!\n", ha->host_no,
+                      __func__));
+        if (test_bit(AF_TOPCAT_CHIP_PRESENT, &ha->flags)) {
+                int status = QLA_ERROR;
+
+                if ((qla4010_soft_reset(ha) == QLA_SUCCESS) &&
+                    (qla4xxx_topcat_reset(ha) == QLA_SUCCESS) &&
+                    (qla4010_soft_reset(ha) == QLA_SUCCESS) )
+                        status = QLA_SUCCESS;
+                return status;
+        } else
+                return qla4010_soft_reset(ha);
+}
+
+/**
+ * qla4xxx_eh_wait_on_command - waits for command to be returned by firmware
+ * @ha: actual ha whose done queue will contain the comd returned by firmware.
+ * @cmd: Scsi Command to wait on.
+ *
+ * This routine waits for the command to be returned by the Firmware
+ * for some max time.
+ **/
+static int qla4xxx_eh_wait_on_command(struct scsi_qla_host *ha,
+                                      struct scsi_cmnd *cmd)
+{
+        int done = 0;
+        struct srb *rp;
+        uint32_t max_wait_time = EH_WAIT_CMD_TOV;
+
+        do {
+                /* Checking to see if its returned to OS */
+                rp = (struct srb *) cmd->SCp.ptr;
+                if (rp == NULL) {
+                        done++;
+                        break;
+                }
+
+                msleep(2000);
+        } while (max_wait_time--);
+
+        return done;
+}
+
+/**
+ * qla4xxx_wait_for_hba_online - waits for HBA to come online
+ * @ha: Pointer to host adapter structure
+ **/
+static int qla4xxx_wait_for_hba_online(struct scsi_qla_host *ha)
+{
+        unsigned long wait_online;
+
+        wait_online = jiffies + (30 * HZ);
+        while (time_before(jiffies, wait_online)) {
+
+                if (adapter_up(ha))
+                        return QLA_SUCCESS;
+                else if (ha->retry_reset_ha_cnt == 0)
+                        return QLA_ERROR;
+
+                msleep(2000);
+        }
+
+        return QLA_ERROR;
+}
+
+/**
+ * qla4xxx_eh_wait_for_active_target_commands - wait for active cmds to finish.
+ * @ha: pointer to to HBA
+ * @t: target id
+ * @l: lun id
+ *
+ * This function waits for all outstanding commands to a lun to complete. It
+ * returns 0 if all pending commands are returned and 1 otherwise.
+ **/
+static int qla4xxx_eh_wait_for_active_target_commands(struct scsi_qla_host *ha,
+                                                 int t, int l)
+{
+        int cnt;
+        int status = 0;
+        struct scsi_cmnd *cmd;
+
+        /*
+         * Waiting for all commands for the designated target in the active
+         * array
+         */
+        for (cnt = 0; cnt < ha->host->can_queue; cnt++) {
+                cmd = scsi_host_find_tag(ha->host, cnt);
+                if (cmd && cmd->device->id == t && cmd->device->lun == l) {
+                        if (!qla4xxx_eh_wait_on_command(ha, cmd)) {
+                                status++;
+                                break;
+                        }
+                }
+        }
+        return status;
+}
+
+/**
+ * qla4xxx_eh_device_reset - callback for target reset.
+ * @cmd: Pointer to Linux's SCSI command structure
+ *
+ * This routine is called by the Linux OS to reset all luns on the
+ * specified target.
+ **/
+static int qla4xxx_eh_device_reset(struct scsi_cmnd *cmd)
+{
+        struct scsi_qla_host *ha = to_qla_host(cmd->device->host);
+        struct ddb_entry *ddb_entry = cmd->device->hostdata;
+        struct srb *sp;
+        int ret = FAILED, stat;
+
+        sp = (struct srb *) cmd->SCp.ptr;
+        if (!sp || !ddb_entry)
+                return ret;
+
+        dev_info(&ha->pdev->dev,
+                   "scsi%ld:%d:%d:%d: DEVICE RESET ISSUED.\n", ha->host_no,
+                   cmd->device->channel, cmd->device->id, cmd->device->lun);
+
+        DEBUG2(printk(KERN_INFO
+                      "scsi%ld: DEVICE_RESET cmd=%p jiffies = 0x%lx, to=%x,"
+                      "dpc_flags=%lx, status=%x allowed=%d\n", ha->host_no,
+                      cmd, jiffies, cmd->timeout_per_command / HZ,
+                      ha->dpc_flags, cmd->result, cmd->allowed));
+
+        /* FIXME: wait for hba to go online */
+        stat = qla4xxx_reset_lun(ha, ddb_entry, cmd->device->lun);
+        if (stat != QLA_SUCCESS) {
+                dev_info(&ha->pdev->dev, "DEVICE RESET FAILED. %d\n", stat);
+                goto eh_dev_reset_done;
+        }
+
+        /* Send marker. */
+        ha->marker_needed = 1;
+
+        /*
+         * If we are coming down the EH path, wait for all commands to complete
+         * for the device.
+         */
+        if (cmd->device->host->shost_state == SHOST_RECOVERY) {
+                if (qla4xxx_eh_wait_for_active_target_commands(ha,
+                                                          cmd->device->id,
+                                                          cmd->device->lun)){
+                        dev_info(&ha->pdev->dev,
+                                   "DEVICE RESET FAILED - waiting for "
+                                   "commands.\n");
+                        goto eh_dev_reset_done;
+                }
+        }
+
+        dev_info(&ha->pdev->dev,
+                   "scsi(%ld:%d:%d:%d): DEVICE RESET SUCCEEDED.\n",
+                   ha->host_no, cmd->device->channel, cmd->device->id,
+                   cmd->device->lun);
+
+        ret = SUCCESS;
+
+eh_dev_reset_done:
+
+        return ret;
+}
+
+/**
+ * qla4xxx_eh_host_reset - kernel callback
+ * @cmd: Pointer to Linux's SCSI command structure
+ *
+ * This routine is invoked by the Linux kernel to perform fatal error
+ * recovery on the specified adapter.
+ **/
+static int qla4xxx_eh_host_reset(struct scsi_cmnd *cmd)
+{
+        int return_status = FAILED;
+        struct scsi_qla_host *ha;
+
+        ha = (struct scsi_qla_host *) cmd->device->host->hostdata;
+
+        dev_info(&ha->pdev->dev,
+                   "scsi(%ld:%d:%d:%d): ADAPTER RESET ISSUED.\n", ha->host_no,
+                   cmd->device->channel, cmd->device->id, cmd->device->lun);
+
+        if (qla4xxx_wait_for_hba_online(ha) != QLA_SUCCESS) {
+                DEBUG2(printk("scsi%ld:%d: %s: Unable to reset host.  Adapter "
+                              "DEAD.\n", ha->host_no, cmd->device->channel,
+                              __func__));
+
+                return FAILED;
+        }
+
+        if (qla4xxx_recover_adapter(ha, PRESERVE_DDB_LIST) == QLA_SUCCESS) {
+                return_status = SUCCESS;
+        }
+
+        dev_info(&ha->pdev->dev, "HOST RESET %s.\n",
+                   return_status == FAILED ? "FAILED" : "SUCCEDED");
+
+        return return_status;
+}
+
+
+static struct pci_device_id qla4xxx_pci_tbl[] = {
+        {
+                .vendor         = PCI_VENDOR_ID_QLOGIC,
+                .device         = PCI_DEVICE_ID_QLOGIC_ISP4010,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+        },
+        {
+                .vendor         = PCI_VENDOR_ID_QLOGIC,
+                .device         = PCI_DEVICE_ID_QLOGIC_ISP4022,
+                .subvendor      = PCI_ANY_ID,
+                .subdevice      = PCI_ANY_ID,
+        },
+        {0, 0},
+};
+MODULE_DEVICE_TABLE(pci, qla4xxx_pci_tbl);
+
+struct pci_driver qla4xxx_pci_driver = {
+        .name           = DRIVER_NAME,
+        .id_table       = qla4xxx_pci_tbl,
+        .probe          = qla4xxx_probe_adapter,
+        .remove         = qla4xxx_remove_adapter,
+};
+
+static int __init qla4xxx_module_init(void)
+{
+        int ret;
+
+        /* Allocate cache for SRBs. */
+        srb_cachep = kmem_cache_create("qla4xxx_srbs", sizeof(struct srb), 0,
+                                       SLAB_HWCACHE_ALIGN, NULL, NULL);
+        if (srb_cachep == NULL) {
+                printk(KERN_ERR
+                       "%s: Unable to allocate SRB cache..."
+                       "Failing load!\n", DRIVER_NAME);
+                ret = -ENOMEM;
+                goto no_srp_cache;
+        }
+
+        /* Derive version string. */
+        strcpy(qla4xxx_version_str, QLA4XXX_DRIVER_VERSION);
+        if (extended_error_logging)
+                strcat(qla4xxx_version_str, "-debug");
+
+        qla4xxx_scsi_transport =
+                iscsi_register_transport(&qla4xxx_iscsi_transport);
+        if (!qla4xxx_scsi_transport){
+                ret = -ENODEV;
+                goto release_srb_cache;
+        }
+
+        printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
+        ret = pci_register_driver(&qla4xxx_pci_driver);
+        if (ret)
+                goto unregister_transport;
+
+        printk(KERN_INFO "QLogic iSCSI HBA Driver\n");
+        return 0;
+unregister_transport:
+        iscsi_unregister_transport(&qla4xxx_iscsi_transport);
+release_srb_cache:
+        kmem_cache_destroy(srb_cachep);
+no_srp_cache:
+        return ret;
+}
+
+static void __exit qla4xxx_module_exit(void)
+{
+        pci_unregister_driver(&qla4xxx_pci_driver);
+        iscsi_unregister_transport(&qla4xxx_iscsi_transport);
+        kmem_cache_destroy(srb_cachep);
+}
+
+module_init(qla4xxx_module_init);
+module_exit(qla4xxx_module_exit);
+
+MODULE_AUTHOR("QLogic Corporation");
+MODULE_DESCRIPTION("QLogic iSCSI HBA Driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(QLA4XXX_DRIVER_VERSION);