[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 00000000000..5036ebf013a
--- /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);