// SPDX-License-Identifier: GPL-2.0-only
/*
 * QLogic iSCSI HBA Driver
 * Copyright (c)  2003-2013 QLogic Corporation
 */

#include "ql4_def.h"
#include "ql4_glbl.h"
#include "ql4_dbg.h"
#include "ql4_inline.h"

/**
 * qla4xxx_copy_sense - copy sense data into cmd sense buffer
 * @ha: Pointer to host adapter structure.
 * @sts_entry: Pointer to status entry structure.
 * @srb: Pointer to srb structure.
 **/
static void qla4xxx_copy_sense(struct scsi_qla_host *ha,
                               struct status_entry *sts_entry,
                               struct srb *srb)
{
        struct scsi_cmnd *cmd = srb->cmd;
        uint16_t sense_len;

        memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
        sense_len = le16_to_cpu(sts_entry->senseDataByteCnt);
        if (sense_len == 0) {
                DEBUG2(ql4_printk(KERN_INFO, ha, "scsi%ld:%d:%d:%llu: %s:"
                                  " sense len 0\n", ha->host_no,
                                  cmd->device->channel, cmd->device->id,
                                  cmd->device->lun, __func__));
                ha->status_srb = NULL;
                return;
        }
        /* Save total available sense length,
         * not to exceed cmd's sense buffer size */
        sense_len = min_t(uint16_t, sense_len, SCSI_SENSE_BUFFERSIZE);
        srb->req_sense_ptr = cmd->sense_buffer;
        srb->req_sense_len = sense_len;

        /* Copy sense from sts_entry pkt */
        sense_len = min_t(uint16_t, sense_len, IOCB_MAX_SENSEDATA_LEN);
        memcpy(cmd->sense_buffer, sts_entry->senseData, sense_len);

        DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%llu: %s: sense key = %x, "
                "ASL= %02x, ASC/ASCQ = %02x/%02x\n", ha->host_no,
                cmd->device->channel, cmd->device->id,
                cmd->device->lun, __func__,
                sts_entry->senseData[2] & 0x0f,
                sts_entry->senseData[7],
                sts_entry->senseData[12],
                sts_entry->senseData[13]));

        DEBUG5(qla4xxx_dump_buffer(cmd->sense_buffer, sense_len));
        srb->flags |= SRB_GOT_SENSE;

        /* Update srb, in case a sts_cont pkt follows */
        srb->req_sense_ptr += sense_len;
        srb->req_sense_len -= sense_len;
        if (srb->req_sense_len != 0)
                ha->status_srb = srb;
        else
                ha->status_srb = NULL;
}

/**
 * qla4xxx_status_cont_entry - Process a Status Continuations entry.
 * @ha: SCSI driver HA context
 * @sts_cont: Entry pointer
 *
 * Extended sense data.
 */
static void
qla4xxx_status_cont_entry(struct scsi_qla_host *ha,
                          struct status_cont_entry *sts_cont)
{
        struct srb *srb = ha->status_srb;
        struct scsi_cmnd *cmd;
        uint16_t sense_len;

        if (srb == NULL)
                return;

        cmd = srb->cmd;
        if (cmd == NULL) {
                DEBUG2(printk(KERN_INFO "scsi%ld: %s: Cmd already returned "
                        "back to OS srb=%p srb->state:%d\n", ha->host_no,
                        __func__, srb, srb->state));
                ha->status_srb = NULL;
                return;
        }

        /* Copy sense data. */
        sense_len = min_t(uint16_t, srb->req_sense_len,
                          IOCB_MAX_EXT_SENSEDATA_LEN);
        memcpy(srb->req_sense_ptr, sts_cont->ext_sense_data, sense_len);
        DEBUG5(qla4xxx_dump_buffer(srb->req_sense_ptr, sense_len));

        srb->req_sense_ptr += sense_len;
        srb->req_sense_len -= sense_len;

        /* Place command on done queue. */
        if (srb->req_sense_len == 0) {
                kref_put(&srb->srb_ref, qla4xxx_srb_compl);
                ha->status_srb = NULL;
        }
}

/**
 * qla4xxx_status_entry - processes status IOCBs
 * @ha: Pointer to host adapter structure.
 * @sts_entry: Pointer to status entry structure.
 **/
static void qla4xxx_status_entry(struct scsi_qla_host *ha,
                                 struct status_entry *sts_entry)
{
        uint8_t scsi_status;
        struct scsi_cmnd *cmd;
        struct srb *srb;
        struct ddb_entry *ddb_entry;
        uint32_t residual;

        srb = qla4xxx_del_from_active_array(ha, le32_to_cpu(sts_entry->handle));
        if (!srb) {
                ql4_printk(KERN_WARNING, ha, "%s invalid status entry: "
                           "handle=0x%0x, srb=%p\n", __func__,
                           sts_entry->handle, srb);
                if (is_qla80XX(ha))
                        set_bit(DPC_RESET_HA_FW_CONTEXT, &ha->dpc_flags);
                else
                        set_bit(DPC_RESET_HA, &ha->dpc_flags);
                return;
        }

        cmd = srb->cmd;
        if (cmd == NULL) {
                DEBUG2(printk("scsi%ld: %s: Command already returned back to "
                              "OS pkt->handle=%d srb=%p srb->state:%d\n",
                              ha->host_no, __func__, sts_entry->handle,
                              srb, srb->state));
                ql4_printk(KERN_WARNING, ha, "Command is NULL:"
                    " already returned to OS (srb=%p)\n", srb);
                return;
        }

        ddb_entry = srb->ddb;
        if (ddb_entry == NULL) {
                cmd->result = DID_NO_CONNECT << 16;
                goto status_entry_exit;
        }

        residual = le32_to_cpu(sts_entry->residualByteCnt);

        /* Translate ISP error to a Linux SCSI error. */
        scsi_status = sts_entry->scsiStatus;
        switch (sts_entry->completionStatus) {
        case SCS_COMPLETE:

                if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) {
                        cmd->result = DID_ERROR << 16;
                        break;
                }

                if (sts_entry->iscsiFlags &ISCSI_FLAG_RESIDUAL_UNDER) {
                        scsi_set_resid(cmd, residual);
                        if (!scsi_status && ((scsi_bufflen(cmd) - residual) <
                                cmd->underflow)) {

                                cmd->result = DID_ERROR << 16;

                                DEBUG2(printk("scsi%ld:%d:%d:%llu: %s: "
                                        "Mid-layer Data underrun0, "
                                        "xferlen = 0x%x, "
                                        "residual = 0x%x\n", ha->host_no,
                                        cmd->device->channel,
                                        cmd->device->id,
                                        cmd->device->lun, __func__,
                                        scsi_bufflen(cmd), residual));
                                break;
                        }
                }

                cmd->result = DID_OK << 16 | scsi_status;

                if (scsi_status != SAM_STAT_CHECK_CONDITION)
                        break;

                /* Copy Sense Data into sense buffer. */
                qla4xxx_copy_sense(ha, sts_entry, srb);
                break;

        case SCS_INCOMPLETE:
                /* Always set the status to DID_ERROR, since
                 * all conditions result in that status anyway */
                cmd->result = DID_ERROR << 16;
                break;

        case SCS_RESET_OCCURRED:
                DEBUG2(printk("scsi%ld:%d:%d:%llu: %s: Device RESET occurred\n",
                              ha->host_no, cmd->device->channel,
                              cmd->device->id, cmd->device->lun, __func__));

                cmd->result = DID_RESET << 16;
                break;

        case SCS_ABORTED:
                DEBUG2(printk("scsi%ld:%d:%d:%llu: %s: Abort occurred\n",
                              ha->host_no, cmd->device->channel,
                              cmd->device->id, cmd->device->lun, __func__));

                cmd->result = DID_RESET << 16;
                break;

        case SCS_TIMEOUT:
                DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%llu: Timeout\n",
                              ha->host_no, cmd->device->channel,
                              cmd->device->id, cmd->device->lun));

                cmd->result = DID_TRANSPORT_DISRUPTED << 16;

                /*
                 * Mark device missing so that we won't continue to send
                 * I/O to this device.  We should get a ddb state change
                 * AEN soon.
                 */
                if (iscsi_is_session_online(ddb_entry->sess))
                        qla4xxx_mark_device_missing(ddb_entry->sess);
                break;

        case SCS_DATA_UNDERRUN:
        case SCS_DATA_OVERRUN:
                if ((sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_OVER) ||
                     (sts_entry->completionStatus == SCS_DATA_OVERRUN)) {
                        DEBUG2(printk("scsi%ld:%d:%d:%llu: %s: " "Data overrun\n",
                                      ha->host_no,
                                      cmd->device->channel, cmd->device->id,
                                      cmd->device->lun, __func__));

                        cmd->result = DID_ERROR << 16;
                        break;
                }

                scsi_set_resid(cmd, residual);

                if (sts_entry->iscsiFlags & ISCSI_FLAG_RESIDUAL_UNDER) {

                        /* Both the firmware and target reported UNDERRUN:
                         *
                         * MID-LAYER UNDERFLOW case:
                         * Some kernels do not properly detect midlayer
                         * underflow, so we manually check it and return
                         * ERROR if the minimum required data was not
                         * received.
                         *
                         * ALL OTHER cases:
                         * Fall thru to check scsi_status
                         */
                        if (!scsi_status && (scsi_bufflen(cmd) - residual) <
                            cmd->underflow) {
                                DEBUG2(ql4_printk(KERN_INFO, ha,
                                                  "scsi%ld:%d:%d:%llu: %s: Mid-layer Data underrun, xferlen = 0x%x,residual = 0x%x\n",
                                                   ha->host_no,
                                                   cmd->device->channel,
                                                   cmd->device->id,
                                                   cmd->device->lun, __func__,
                                                   scsi_bufflen(cmd),
                                                   residual));

                                cmd->result = DID_ERROR << 16;
                                break;
                        }

                } else if (scsi_status != SAM_STAT_TASK_SET_FULL &&
                           scsi_status != SAM_STAT_BUSY) {

                        /*
                         * The firmware reports UNDERRUN, but the target does
                         * not report it:
                         *
                         *   scsi_status     |    host_byte       device_byte
                         *                   |     (19:16)          (7:0)
                         *   =============   |    =========       ===========
                         *   TASK_SET_FULL   |    DID_OK          scsi_status
                         *   BUSY            |    DID_OK          scsi_status
                         *   ALL OTHERS      |    DID_ERROR       scsi_status
                         *
                         *   Note: If scsi_status is task set full or busy,
                         *   then this else if would fall thru to check the
                         *   scsi_status and return DID_OK.
                         */

                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "scsi%ld:%d:%d:%llu: %s: Dropped frame(s) detected (0x%x of 0x%x bytes).\n",
                                          ha->host_no,
                                          cmd->device->channel,
                                          cmd->device->id,
                                          cmd->device->lun, __func__,
                                          residual,
                                          scsi_bufflen(cmd)));

                        cmd->result = DID_ERROR << 16 | scsi_status;
                        goto check_scsi_status;
                }

                cmd->result = DID_OK << 16 | scsi_status;

check_scsi_status:
                if (scsi_status == SAM_STAT_CHECK_CONDITION)
                        qla4xxx_copy_sense(ha, sts_entry, srb);

                break;

        case SCS_DEVICE_LOGGED_OUT:
        case SCS_DEVICE_UNAVAILABLE:
                DEBUG2(printk(KERN_INFO "scsi%ld:%d:%d:%llu: SCS_DEVICE "
                    "state: 0x%x\n", ha->host_no,
                    cmd->device->channel, cmd->device->id,
                    cmd->device->lun, sts_entry->completionStatus));
                /*
                 * Mark device missing so that we won't continue to
                 * send I/O to this device.  We should get a ddb
                 * state change AEN soon.
                 */
                if (iscsi_is_session_online(ddb_entry->sess))
                        qla4xxx_mark_device_missing(ddb_entry->sess);

                cmd->result = DID_TRANSPORT_DISRUPTED << 16;
                break;

        case SCS_QUEUE_FULL:
                /*
                 * SCSI Mid-Layer handles device queue full
                 */
                cmd->result = DID_OK << 16 | sts_entry->scsiStatus;
                DEBUG2(printk("scsi%ld:%d:%llu: %s: QUEUE FULL detected "
                              "compl=%02x, scsi=%02x, state=%02x, iFlags=%02x,"
                              " iResp=%02x\n", ha->host_no, cmd->device->id,
                              cmd->device->lun, __func__,
                              sts_entry->completionStatus,
                              sts_entry->scsiStatus, sts_entry->state_flags,
                              sts_entry->iscsiFlags,
                              sts_entry->iscsiResponse));
                break;

        default:
                cmd->result = DID_ERROR << 16;
                break;
        }

status_entry_exit:

        /* complete the request, if not waiting for status_continuation pkt */
        srb->cc_stat = sts_entry->completionStatus;
        if (ha->status_srb == NULL)
                kref_put(&srb->srb_ref, qla4xxx_srb_compl);
}

/**
 * qla4xxx_passthru_status_entry - processes passthru status IOCBs (0x3C)
 * @ha: Pointer to host adapter structure.
 * @sts_entry: Pointer to status entry structure.
 **/
static void qla4xxx_passthru_status_entry(struct scsi_qla_host *ha,
                                          struct passthru_status *sts_entry)
{
        struct iscsi_task *task;
        struct ddb_entry *ddb_entry;
        struct ql4_task_data *task_data;
        struct iscsi_cls_conn *cls_conn;
        struct iscsi_conn *conn;
        itt_t itt;
        uint32_t fw_ddb_index;

        itt = sts_entry->handle;
        fw_ddb_index = le32_to_cpu(sts_entry->target);

        ddb_entry = qla4xxx_lookup_ddb_by_fw_index(ha, fw_ddb_index);

        if (ddb_entry == NULL) {
                ql4_printk(KERN_ERR, ha, "%s: Invalid target index = 0x%x\n",
                           __func__, sts_entry->target);
                return;
        }

        cls_conn = ddb_entry->conn;
        conn = cls_conn->dd_data;
        spin_lock(&conn->session->back_lock);
        task = iscsi_itt_to_task(conn, itt);
        spin_unlock(&conn->session->back_lock);

        if (task == NULL) {
                ql4_printk(KERN_ERR, ha, "%s: Task is NULL\n", __func__);
                return;
        }

        task_data = task->dd_data;
        memcpy(&task_data->sts, sts_entry, sizeof(struct passthru_status));
        ha->iocb_cnt -= task_data->iocb_req_cnt;
        queue_work(ha->task_wq, &task_data->task_work);
}

static struct mrb *qla4xxx_del_mrb_from_active_array(struct scsi_qla_host *ha,
                                                     uint32_t index)
{
        struct mrb *mrb = NULL;

        /* validate handle and remove from active array */
        if (index >= MAX_MRB)
                return mrb;

        mrb = ha->active_mrb_array[index];
        ha->active_mrb_array[index] = NULL;
        if (!mrb)
                return mrb;

        /* update counters */
        ha->iocb_cnt -= mrb->iocb_cnt;

        return mrb;
}

static void qla4xxx_mbox_status_entry(struct scsi_qla_host *ha,
                                      struct mbox_status_iocb *mbox_sts_entry)
{
        struct mrb *mrb;
        uint32_t status;
        uint32_t data_size;

        mrb = qla4xxx_del_mrb_from_active_array(ha,
                                        le32_to_cpu(mbox_sts_entry->handle));

        if (mrb == NULL) {
                ql4_printk(KERN_WARNING, ha, "%s: mrb[%d] is null\n", __func__,
                           mbox_sts_entry->handle);
                return;
        }

        switch (mrb->mbox_cmd) {
        case MBOX_CMD_PING:
                DEBUG2(ql4_printk(KERN_INFO, ha, "%s: mbox_cmd = 0x%x, "
                                  "mbox_sts[0] = 0x%x, mbox_sts[6] = 0x%x\n",
                                  __func__, mrb->mbox_cmd,
                                  mbox_sts_entry->out_mbox[0],
                                  mbox_sts_entry->out_mbox[6]));

                if (mbox_sts_entry->out_mbox[0] == MBOX_STS_COMMAND_COMPLETE)
                        status = ISCSI_PING_SUCCESS;
                else
                        status = mbox_sts_entry->out_mbox[6];

                data_size = sizeof(mbox_sts_entry->out_mbox);

                qla4xxx_post_ping_evt_work(ha, status, mrb->pid, data_size,
                                        (uint8_t *) mbox_sts_entry->out_mbox);
                break;

        default:
                DEBUG2(ql4_printk(KERN_WARNING, ha, "%s: invalid mbox_cmd = "
                                  "0x%x\n", __func__, mrb->mbox_cmd));
        }

        kfree(mrb);
        return;
}

/**
 * qla4xxx_process_response_queue - process response queue completions
 * @ha: Pointer to host adapter structure.
 *
 * This routine process response queue completions in interrupt context.
 * Hardware_lock locked upon entry
 **/
void qla4xxx_process_response_queue(struct scsi_qla_host *ha)
{
        struct srb *srb = NULL;
        struct status_entry *sts_entry;

        /* Process all responses from response queue */
        while ((ha->response_ptr->signature != RESPONSE_PROCESSED)) {
                sts_entry = (struct status_entry *) ha->response_ptr;

                /* Advance pointers for next entry */
                if (ha->response_out == (RESPONSE_QUEUE_DEPTH - 1)) {
                        ha->response_out = 0;
                        ha->response_ptr = ha->response_ring;
                } else {
                        ha->response_out++;
                        ha->response_ptr++;
                }

                /* process entry */
                switch (sts_entry->hdr.entryType) {
                case ET_STATUS:
                        /* Common status */
                        qla4xxx_status_entry(ha, sts_entry);
                        break;

                case ET_PASSTHRU_STATUS:
                        if (sts_entry->hdr.systemDefined == SD_ISCSI_PDU)
                                qla4xxx_passthru_status_entry(ha,
                                        (struct passthru_status *)sts_entry);
                        else
                                ql4_printk(KERN_ERR, ha,
                                           "%s: Invalid status received\n",
                                           __func__);

                        break;

                case ET_STATUS_CONTINUATION:
                        qla4xxx_status_cont_entry(ha,
                                (struct status_cont_entry *) sts_entry);
                        break;

                case ET_COMMAND:
                        /* ISP device queue is full. Command not
                         * accepted by ISP.  Queue command for
                         * later */

                        srb = qla4xxx_del_from_active_array(ha,
                                                    le32_to_cpu(sts_entry->
                                                                handle));
                        if (srb == NULL)
                                goto exit_prq_invalid_handle;

                        DEBUG2(printk("scsi%ld: %s: FW device queue full, "
                                      "srb %p\n", ha->host_no, __func__, srb));

                        /* ETRY normally by sending it back with
                         * DID_BUS_BUSY */
                        srb->cmd->result = DID_BUS_BUSY << 16;
                        kref_put(&srb->srb_ref, qla4xxx_srb_compl);
                        break;

                case ET_CONTINUE:
                        /* Just throw away the continuation entries */
                        DEBUG2(printk("scsi%ld: %s: Continuation entry - "
                                      "ignoring\n", ha->host_no, __func__));
                        break;

                case ET_MBOX_STATUS:
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "%s: mbox status IOCB\n", __func__));
                        qla4xxx_mbox_status_entry(ha,
                                        (struct mbox_status_iocb *)sts_entry);
                        break;

                default:
                        /*
                         * Invalid entry in response queue, reset RISC
                         * firmware.
                         */
                        DEBUG2(printk("scsi%ld: %s: Invalid entry %x in "
                                      "response queue \n", ha->host_no,
                                      __func__,
                                      sts_entry->hdr.entryType));
                        goto exit_prq_error;
                }
                ((struct response *)sts_entry)->signature = RESPONSE_PROCESSED;
                wmb();
        }

        /*
         * Tell ISP we're done with response(s). This also clears the interrupt.
         */
        ha->isp_ops->complete_iocb(ha);

        return;

exit_prq_invalid_handle:
        DEBUG2(printk("scsi%ld: %s: Invalid handle(srb)=%p type=%x IOCS=%x\n",
                      ha->host_no, __func__, srb, sts_entry->hdr.entryType,
                      sts_entry->completionStatus));

exit_prq_error:
        ha->isp_ops->complete_iocb(ha);
        set_bit(DPC_RESET_HA, &ha->dpc_flags);
}

/**
 * qla4_83xx_loopback_in_progress: Is loopback in progress?
 * @ha: Pointer to host adapter structure.
 * returns: 1 = loopback in progress, 0 = loopback not in progress
 **/
static int qla4_83xx_loopback_in_progress(struct scsi_qla_host *ha)
{
        int rval = 1;

        if (is_qla8032(ha) || is_qla8042(ha)) {
                if ((ha->idc_info.info2 & ENABLE_INTERNAL_LOOPBACK) ||
                    (ha->idc_info.info2 & ENABLE_EXTERNAL_LOOPBACK)) {
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "%s: Loopback diagnostics in progress\n",
                                          __func__));
                        rval = 1;
                } else {
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "%s: Loopback diagnostics not in progress\n",
                                          __func__));
                        rval = 0;
                }
        }

        return rval;
}

static void qla4xxx_update_ipaddr_state(struct scsi_qla_host *ha,
                                        uint32_t ipaddr_idx,
                                        uint32_t ipaddr_fw_state)
{
        uint8_t ipaddr_state;
        uint8_t ip_idx;

        ip_idx = ipaddr_idx & 0xF;
        ipaddr_state = qla4xxx_set_ipaddr_state((uint8_t)ipaddr_fw_state);

        switch (ip_idx) {
        case 0:
                ha->ip_config.ipv4_addr_state = ipaddr_state;
                break;
        case 1:
                ha->ip_config.ipv6_link_local_state = ipaddr_state;
                break;
        case 2:
                ha->ip_config.ipv6_addr0_state = ipaddr_state;
                break;
        case 3:
                ha->ip_config.ipv6_addr1_state = ipaddr_state;
                break;
        default:
                ql4_printk(KERN_INFO, ha, "%s: Invalid IPADDR index %d\n",
                           __func__, ip_idx);
        }
}

static void qla4xxx_default_router_changed(struct scsi_qla_host *ha,
                                           uint32_t *mbox_sts)
{
        memcpy(&ha->ip_config.ipv6_default_router_addr.s6_addr32[0],
               &mbox_sts[2], sizeof(uint32_t));
        memcpy(&ha->ip_config.ipv6_default_router_addr.s6_addr32[1],
               &mbox_sts[3], sizeof(uint32_t));
        memcpy(&ha->ip_config.ipv6_default_router_addr.s6_addr32[2],
               &mbox_sts[4], sizeof(uint32_t));
        memcpy(&ha->ip_config.ipv6_default_router_addr.s6_addr32[3],
               &mbox_sts[5], sizeof(uint32_t));
}

/**
 * qla4xxx_isr_decode_mailbox - decodes mailbox status
 * @ha: Pointer to host adapter structure.
 * @mbox_status: Mailbox status.
 *
 * This routine decodes the mailbox status during the ISR.
 * Hardware_lock locked upon entry. runs in interrupt context.
 **/
static void qla4xxx_isr_decode_mailbox(struct scsi_qla_host * ha,
                                       uint32_t mbox_status)
{
        int i;
        uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
        __le32 __iomem *mailbox_out;
        uint32_t opcode = 0;

        if (is_qla8032(ha) || is_qla8042(ha))
                mailbox_out = &ha->qla4_83xx_reg->mailbox_out[0];
        else if (is_qla8022(ha))
                mailbox_out = &ha->qla4_82xx_reg->mailbox_out[0];
        else
                mailbox_out = &ha->reg->mailbox[0];

        if ((mbox_status == MBOX_STS_BUSY) ||
            (mbox_status == MBOX_STS_INTERMEDIATE_COMPLETION) ||
            (mbox_status >> 12 == MBOX_COMPLETION_STATUS)) {
                ha->mbox_status[0] = mbox_status;

                if (test_bit(AF_MBOX_COMMAND, &ha->flags)) {
                        /*
                         * Copy all mailbox registers to a temporary
                         * location and set mailbox command done flag
                         */
                        for (i = 0; i < ha->mbox_status_count; i++)
                                ha->mbox_status[i] = readl(&mailbox_out[i]);

                        set_bit(AF_MBOX_COMMAND_DONE, &ha->flags);

                        if (test_bit(AF_MBOX_COMMAND_NOPOLL, &ha->flags))
                                complete(&ha->mbx_intr_comp);
                }
        } else if (mbox_status >> 12 == MBOX_ASYNC_EVENT_STATUS) {
                for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
                        mbox_sts[i] = readl(&mailbox_out[i]);

                /* Immediately process the AENs that don't require much work.
                 * Only queue the database_changed AENs */
                if (ha->aen_log.count < MAX_AEN_ENTRIES) {
                        for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
                                ha->aen_log.entry[ha->aen_log.count].mbox_sts[i] =
                                    mbox_sts[i];
                        ha->aen_log.count++;
                }
                switch (mbox_status) {
                case MBOX_ASTS_SYSTEM_ERROR:
                        /* Log Mailbox registers */
                        ql4_printk(KERN_INFO, ha, "%s: System Err\n", __func__);
                        qla4xxx_dump_registers(ha);

                        if ((is_qla8022(ha) && ql4xdontresethba) ||
                            ((is_qla8032(ha) || is_qla8042(ha)) &&
                             qla4_83xx_idc_dontreset(ha))) {
                                DEBUG2(printk("scsi%ld: %s:Don't Reset HBA\n",
                                    ha->host_no, __func__));
                        } else {
                                set_bit(AF_GET_CRASH_RECORD, &ha->flags);
                                set_bit(DPC_RESET_HA, &ha->dpc_flags);
                        }
                        break;

                case MBOX_ASTS_REQUEST_TRANSFER_ERROR:
                case MBOX_ASTS_RESPONSE_TRANSFER_ERROR:
                case MBOX_ASTS_NVRAM_INVALID:
                case MBOX_ASTS_IP_ADDRESS_CHANGED:
                case MBOX_ASTS_DHCP_LEASE_EXPIRED:
                        DEBUG2(printk("scsi%ld: AEN %04x, ERROR Status, "
                                      "Reset HA\n", ha->host_no, mbox_status));
                        if (is_qla80XX(ha))
                                set_bit(DPC_RESET_HA_FW_CONTEXT,
                                        &ha->dpc_flags);
                        else
                                set_bit(DPC_RESET_HA, &ha->dpc_flags);
                        break;

                case MBOX_ASTS_LINK_UP:
                        set_bit(AF_LINK_UP, &ha->flags);
                        if (test_bit(AF_INIT_DONE, &ha->flags))
                                set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);

                        ql4_printk(KERN_INFO, ha, "%s: LINK UP\n", __func__);
                        qla4xxx_post_aen_work(ha, ISCSI_EVENT_LINKUP,
                                              sizeof(mbox_sts),
                                              (uint8_t *) mbox_sts);

                        if ((is_qla8032(ha) || is_qla8042(ha)) &&
                            ha->notify_link_up_comp)
                                complete(&ha->link_up_comp);

                        break;

                case MBOX_ASTS_LINK_DOWN:
                        clear_bit(AF_LINK_UP, &ha->flags);
                        if (test_bit(AF_INIT_DONE, &ha->flags)) {
                                set_bit(DPC_LINK_CHANGED, &ha->dpc_flags);
                                qla4xxx_wake_dpc(ha);
                        }

                        ql4_printk(KERN_INFO, ha, "%s: LINK DOWN\n", __func__);
                        qla4xxx_post_aen_work(ha, ISCSI_EVENT_LINKDOWN,
                                              sizeof(mbox_sts),
                                              (uint8_t *) mbox_sts);
                        break;

                case MBOX_ASTS_HEARTBEAT:
                        ha->seconds_since_last_heartbeat = 0;
                        break;

                case MBOX_ASTS_DHCP_LEASE_ACQUIRED:
                        DEBUG2(printk("scsi%ld: AEN %04x DHCP LEASE "
                                      "ACQUIRED\n", ha->host_no, mbox_status));
                        set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
                        break;

                case MBOX_ASTS_PROTOCOL_STATISTIC_ALARM:
                case MBOX_ASTS_SCSI_COMMAND_PDU_REJECTED: /* Target
                                                           * mode
                                                           * only */
                case MBOX_ASTS_UNSOLICITED_PDU_RECEIVED:  /* Connection mode */
                case MBOX_ASTS_IPSEC_SYSTEM_FATAL_ERROR:
                case MBOX_ASTS_SUBNET_STATE_CHANGE:
                case MBOX_ASTS_DUPLICATE_IP:
                        /* No action */
                        DEBUG2(printk("scsi%ld: AEN %04x\n", ha->host_no,
                                      mbox_status));
                        break;

                case MBOX_ASTS_IP_ADDR_STATE_CHANGED:
                        printk("scsi%ld: AEN %04x, mbox_sts[2]=%04x, "
                            "mbox_sts[3]=%04x\n", ha->host_no, mbox_sts[0],
                            mbox_sts[2], mbox_sts[3]);

                        qla4xxx_update_ipaddr_state(ha, mbox_sts[5],
                                                    mbox_sts[3]);
                        /* mbox_sts[2] = Old ACB state
                         * mbox_sts[3] = new ACB state */
                        if ((mbox_sts[3] == IP_ADDRSTATE_PREFERRED) &&
                            ((mbox_sts[2] == IP_ADDRSTATE_TENTATIVE) ||
                             (mbox_sts[2] == IP_ADDRSTATE_ACQUIRING))) {
                                set_bit(DPC_GET_DHCP_IP_ADDR, &ha->dpc_flags);
                        } else if ((mbox_sts[3] == IP_ADDRSTATE_ACQUIRING) &&
                                   (mbox_sts[2] == IP_ADDRSTATE_PREFERRED)) {
                                if (is_qla80XX(ha))
                                        set_bit(DPC_RESET_HA_FW_CONTEXT,
                                                &ha->dpc_flags);
                                else
                                        set_bit(DPC_RESET_HA, &ha->dpc_flags);
                        } else if (mbox_sts[3] == IP_ADDRSTATE_DISABLING) {
                                ql4_printk(KERN_INFO, ha, "scsi%ld: %s: ACB in disabling state\n",
                                           ha->host_no, __func__);
                        } else if (mbox_sts[3] == IP_ADDRSTATE_UNCONFIGURED) {
                                complete(&ha->disable_acb_comp);
                                ql4_printk(KERN_INFO, ha, "scsi%ld: %s: ACB state unconfigured\n",
                                           ha->host_no, __func__);
                        }
                        break;

                case MBOX_ASTS_IPV6_LINK_MTU_CHANGE:
                case MBOX_ASTS_IPV6_AUTO_PREFIX_IGNORED:
                case MBOX_ASTS_IPV6_ND_LOCAL_PREFIX_IGNORED:
                        /* No action */
                        DEBUG2(ql4_printk(KERN_INFO, ha, "scsi%ld: AEN %04x\n",
                                          ha->host_no, mbox_status));
                        break;

                case MBOX_ASTS_ICMPV6_ERROR_MSG_RCVD:
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "scsi%ld: AEN %04x, IPv6 ERROR, "
                                          "mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3}=%08x, mbox_sts[4]=%08x mbox_sts[5]=%08x\n",
                                          ha->host_no, mbox_sts[0], mbox_sts[1],
                                          mbox_sts[2], mbox_sts[3], mbox_sts[4],
                                          mbox_sts[5]));
                        break;

                case MBOX_ASTS_MAC_ADDRESS_CHANGED:
                case MBOX_ASTS_DNS:
                        /* No action */
                        DEBUG2(printk(KERN_INFO "scsi%ld: AEN %04x, "
                                      "mbox_sts[1]=%04x, mbox_sts[2]=%04x\n",
                                      ha->host_no, mbox_sts[0],
                                      mbox_sts[1], mbox_sts[2]));
                        break;

                case MBOX_ASTS_SELF_TEST_FAILED:
                case MBOX_ASTS_LOGIN_FAILED:
                        /* No action */
                        DEBUG2(printk("scsi%ld: AEN %04x, mbox_sts[1]=%04x, "
                                      "mbox_sts[2]=%04x, mbox_sts[3]=%04x\n",
                                      ha->host_no, mbox_sts[0], mbox_sts[1],
                                      mbox_sts[2], mbox_sts[3]));
                        break;

                case MBOX_ASTS_DATABASE_CHANGED:
                        /* Queue AEN information and process it in the DPC
                         * routine */
                        if (ha->aen_q_count > 0) {

                                /* decrement available counter */
                                ha->aen_q_count--;

                                for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
                                        ha->aen_q[ha->aen_in].mbox_sts[i] =
                                            mbox_sts[i];

                                /* print debug message */
                                DEBUG2(printk("scsi%ld: AEN[%d] %04x queued "
                                              "mb1:0x%x mb2:0x%x mb3:0x%x "
                                              "mb4:0x%x mb5:0x%x\n",
                                              ha->host_no, ha->aen_in,
                                              mbox_sts[0], mbox_sts[1],
                                              mbox_sts[2], mbox_sts[3],
                                              mbox_sts[4], mbox_sts[5]));

                                /* advance pointer */
                                ha->aen_in++;
                                if (ha->aen_in == MAX_AEN_ENTRIES)
                                        ha->aen_in = 0;

                                /* The DPC routine will process the aen */
                                set_bit(DPC_AEN, &ha->dpc_flags);
                        } else {
                                DEBUG2(printk("scsi%ld: %s: aen %04x, queue "
                                              "overflowed!  AEN LOST!!\n",
                                              ha->host_no, __func__,
                                              mbox_sts[0]));

                                DEBUG2(printk("scsi%ld: DUMP AEN QUEUE\n",
                                              ha->host_no));

                                for (i = 0; i < MAX_AEN_ENTRIES; i++) {
                                        DEBUG2(printk("AEN[%d] %04x %04x %04x "
                                                      "%04x\n", i, mbox_sts[0],
                                                      mbox_sts[1], mbox_sts[2],
                                                      mbox_sts[3]));
                                }
                        }
                        break;

                case MBOX_ASTS_TXSCVR_INSERTED:
                        DEBUG2(printk(KERN_WARNING
                            "scsi%ld: AEN %04x Transceiver"
                            " inserted\n",  ha->host_no, mbox_sts[0]));
                        break;

                case MBOX_ASTS_TXSCVR_REMOVED:
                        DEBUG2(printk(KERN_WARNING
                            "scsi%ld: AEN %04x Transceiver"
                            " removed\n",  ha->host_no, mbox_sts[0]));
                        break;

                case MBOX_ASTS_IDC_REQUEST_NOTIFICATION:
                        if (is_qla8032(ha) || is_qla8042(ha)) {
                                DEBUG2(ql4_printk(KERN_INFO, ha,
                                                  "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x\n",
                                                  ha->host_no, mbox_sts[0],
                                                  mbox_sts[1], mbox_sts[2],
                                                  mbox_sts[3], mbox_sts[4]));
                                opcode = mbox_sts[1] >> 16;
                                if ((opcode == MBOX_CMD_SET_PORT_CONFIG) ||
                                    (opcode == MBOX_CMD_PORT_RESET)) {
                                        set_bit(DPC_POST_IDC_ACK,
                                                &ha->dpc_flags);
                                        ha->idc_info.request_desc = mbox_sts[1];
                                        ha->idc_info.info1 = mbox_sts[2];
                                        ha->idc_info.info2 = mbox_sts[3];
                                        ha->idc_info.info3 = mbox_sts[4];
                                        qla4xxx_wake_dpc(ha);
                                }
                        }
                        break;

                case MBOX_ASTS_IDC_COMPLETE:
                        if (is_qla8032(ha) || is_qla8042(ha)) {
                                DEBUG2(ql4_printk(KERN_INFO, ha,
                                                  "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x\n",
                                                  ha->host_no, mbox_sts[0],
                                                  mbox_sts[1], mbox_sts[2],
                                                  mbox_sts[3], mbox_sts[4]));
                                DEBUG2(ql4_printk(KERN_INFO, ha,
                                                  "scsi:%ld: AEN %04x IDC Complete notification\n",
                                                  ha->host_no, mbox_sts[0]));

                                opcode = mbox_sts[1] >> 16;
                                if (ha->notify_idc_comp)
                                        complete(&ha->idc_comp);

                                if ((opcode == MBOX_CMD_SET_PORT_CONFIG) ||
                                    (opcode == MBOX_CMD_PORT_RESET))
                                        ha->idc_info.info2 = mbox_sts[3];

                                if (qla4_83xx_loopback_in_progress(ha)) {
                                        set_bit(AF_LOOPBACK, &ha->flags);
                                } else {
                                        clear_bit(AF_LOOPBACK, &ha->flags);
                                        if (ha->saved_acb)
                                                set_bit(DPC_RESTORE_ACB,
                                                        &ha->dpc_flags);
                                }
                                qla4xxx_wake_dpc(ha);
                        }
                        break;

                case MBOX_ASTS_IPV6_DEFAULT_ROUTER_CHANGED:
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x mbox_sts[5]=%08x\n",
                                          ha->host_no, mbox_sts[0], mbox_sts[1],
                                          mbox_sts[2], mbox_sts[3], mbox_sts[4],
                                          mbox_sts[5]));
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "scsi%ld: AEN %04x Received IPv6 default router changed notification\n",
                                          ha->host_no, mbox_sts[0]));
                        qla4xxx_default_router_changed(ha, mbox_sts);
                        break;

                case MBOX_ASTS_IDC_TIME_EXTEND_NOTIFICATION:
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x mbox_sts[5]=%08x\n",
                                          ha->host_no, mbox_sts[0], mbox_sts[1],
                                          mbox_sts[2], mbox_sts[3], mbox_sts[4],
                                          mbox_sts[5]));
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "scsi%ld: AEN %04x Received IDC Extend Timeout notification\n",
                                          ha->host_no, mbox_sts[0]));
                        /* new IDC timeout */
                        ha->idc_extend_tmo = mbox_sts[1];
                        break;

                case MBOX_ASTS_INITIALIZATION_FAILED:
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "scsi%ld: AEN %04x, mbox_sts[3]=%08x\n",
                                          ha->host_no, mbox_sts[0],
                                          mbox_sts[3]));
                        break;

                case MBOX_ASTS_SYSTEM_WARNING_EVENT:
                        DEBUG2(ql4_printk(KERN_WARNING, ha,
                                          "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x mbox_sts[5]=%08x\n",
                                          ha->host_no, mbox_sts[0], mbox_sts[1],
                                          mbox_sts[2], mbox_sts[3], mbox_sts[4],
                                          mbox_sts[5]));
                        break;

                case MBOX_ASTS_DCBX_CONF_CHANGE:
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "scsi%ld: AEN %04x, mbox_sts[1]=%08x, mbox_sts[2]=%08x, mbox_sts[3]=%08x, mbox_sts[4]=%08x mbox_sts[5]=%08x\n",
                                          ha->host_no, mbox_sts[0], mbox_sts[1],
                                          mbox_sts[2], mbox_sts[3], mbox_sts[4],
                                          mbox_sts[5]));
                        DEBUG2(ql4_printk(KERN_INFO, ha,
                                          "scsi%ld: AEN %04x Received DCBX configuration changed notification\n",
                                          ha->host_no, mbox_sts[0]));
                        break;

                default:
                        DEBUG2(printk(KERN_WARNING
                                      "scsi%ld: AEN %04x UNKNOWN\n",
                                      ha->host_no, mbox_sts[0]));
                        break;
                }
        } else {
                DEBUG2(printk("scsi%ld: Unknown mailbox status %08X\n",
                              ha->host_no, mbox_status));

                ha->mbox_status[0] = mbox_status;
        }
}

void qla4_83xx_interrupt_service_routine(struct scsi_qla_host *ha,
                                         uint32_t intr_status)
{
        /* Process mailbox/asynch event interrupt.*/
        if (intr_status) {
                qla4xxx_isr_decode_mailbox(ha,
                                readl(&ha->qla4_83xx_reg->mailbox_out[0]));
                /* clear the interrupt */
                writel(0, &ha->qla4_83xx_reg->risc_intr);
        } else {
                qla4xxx_process_response_queue(ha);
        }

        /* clear the interrupt */
        writel(0, &ha->qla4_83xx_reg->mb_int_mask);
}

/**
 * qla4_82xx_interrupt_service_routine - isr
 * @ha: pointer to host adapter structure.
 * @intr_status: Local interrupt status/type.
 *
 * This is the main interrupt service routine.
 * hardware_lock locked upon entry. runs in interrupt context.
 **/
void qla4_82xx_interrupt_service_routine(struct scsi_qla_host *ha,
    uint32_t intr_status)
{
        /* Process response queue interrupt. */
        if ((intr_status & HSRX_RISC_IOCB_INT) &&
            test_bit(AF_INIT_DONE, &ha->flags))
                qla4xxx_process_response_queue(ha);

        /* Process mailbox/asynch event interrupt.*/
        if (intr_status & HSRX_RISC_MB_INT)
                qla4xxx_isr_decode_mailbox(ha,
                    readl(&ha->qla4_82xx_reg->mailbox_out[0]));

        /* clear the interrupt */
        writel(0, &ha->qla4_82xx_reg->host_int);
        readl(&ha->qla4_82xx_reg->host_int);
}

/**
 * qla4xxx_interrupt_service_routine - isr
 * @ha: pointer to host adapter structure.
 * @intr_status: Local interrupt status/type.
 *
 * This is the main interrupt service routine.
 * hardware_lock locked upon entry. runs in interrupt context.
 **/
void qla4xxx_interrupt_service_routine(struct scsi_qla_host * ha,
                                       uint32_t intr_status)
{
        /* Process response queue interrupt. */
        if (intr_status & CSR_SCSI_COMPLETION_INTR)
                qla4xxx_process_response_queue(ha);

        /* Process mailbox/asynch event  interrupt.*/
        if (intr_status & CSR_SCSI_PROCESSOR_INTR) {
                qla4xxx_isr_decode_mailbox(ha,
                                           readl(&ha->reg->mailbox[0]));

                /* Clear Mailbox Interrupt */
                writel(set_rmask(CSR_SCSI_PROCESSOR_INTR),
                       &ha->reg->ctrl_status);
                readl(&ha->reg->ctrl_status);
        }
}

/**
 * qla4_82xx_spurious_interrupt - processes spurious interrupt
 * @ha: pointer to host adapter structure.
 * @reqs_count: .
 *
 **/
static void qla4_82xx_spurious_interrupt(struct scsi_qla_host *ha,
    uint8_t reqs_count)
{
        if (reqs_count)
                return;

        DEBUG2(ql4_printk(KERN_INFO, ha, "Spurious Interrupt\n"));
        if (is_qla8022(ha)) {
                writel(0, &ha->qla4_82xx_reg->host_int);
                if (!ha->pdev->msi_enabled && !ha->pdev->msix_enabled)
                        qla4_82xx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg,
                            0xfbff);
        }
        ha->spurious_int_count++;
}

/**
 * qla4xxx_intr_handler - hardware interrupt handler.
 * @irq: Unused
 * @dev_id: Pointer to host adapter structure
 **/
irqreturn_t qla4xxx_intr_handler(int irq, void *dev_id)
{
        struct scsi_qla_host *ha;
        uint32_t intr_status;
        unsigned long flags = 0;
        uint8_t reqs_count = 0;

        ha = (struct scsi_qla_host *) dev_id;
        if (!ha) {
                DEBUG2(printk(KERN_INFO
                              "qla4xxx: Interrupt with NULL host ptr\n"));
                return IRQ_NONE;
        }

        spin_lock_irqsave(&ha->hardware_lock, flags);

        ha->isr_count++;
        /*
         * Repeatedly service interrupts up to a maximum of
         * MAX_REQS_SERVICED_PER_INTR
         */
        while (1) {
                /*
                 * Read interrupt status
                 */
                if (ha->isp_ops->rd_shdw_rsp_q_in(ha) !=
                    ha->response_out)
                        intr_status = CSR_SCSI_COMPLETION_INTR;
                else
                        intr_status = readl(&ha->reg->ctrl_status);

                if ((intr_status &
                    (CSR_SCSI_RESET_INTR|CSR_FATAL_ERROR|INTR_PENDING)) == 0) {
                        if (reqs_count == 0)
                                ha->spurious_int_count++;
                        break;
                }

                if (intr_status & CSR_FATAL_ERROR) {
                        DEBUG2(printk(KERN_INFO "scsi%ld: Fatal Error, "
                                      "Status 0x%04x\n", ha->host_no,
                                      readl(isp_port_error_status (ha))));

                        /* Issue Soft Reset to clear this error condition.
                         * This will prevent the RISC from repeatedly
                         * interrupting the driver; thus, allowing the DPC to
                         * get scheduled to continue error recovery.
                         * NOTE: Disabling RISC interrupts does not work in
                         * this case, as CSR_FATAL_ERROR overrides
                         * CSR_SCSI_INTR_ENABLE */
                        if ((readl(&ha->reg->ctrl_status) &
                             CSR_SCSI_RESET_INTR) == 0) {
                                writel(set_rmask(CSR_SOFT_RESET),
                                       &ha->reg->ctrl_status);
                                readl(&ha->reg->ctrl_status);
                        }

                        writel(set_rmask(CSR_FATAL_ERROR),
                               &ha->reg->ctrl_status);
                        readl(&ha->reg->ctrl_status);

                        __qla4xxx_disable_intrs(ha);

                        set_bit(DPC_RESET_HA, &ha->dpc_flags);

                        break;
                } else if (intr_status & CSR_SCSI_RESET_INTR) {
                        clear_bit(AF_ONLINE, &ha->flags);
                        __qla4xxx_disable_intrs(ha);

                        writel(set_rmask(CSR_SCSI_RESET_INTR),
                               &ha->reg->ctrl_status);
                        readl(&ha->reg->ctrl_status);

                        if (!test_bit(AF_HA_REMOVAL, &ha->flags))
                                set_bit(DPC_RESET_HA_INTR, &ha->dpc_flags);

                        break;
                } else if (intr_status & INTR_PENDING) {
                        ha->isp_ops->interrupt_service_routine(ha, intr_status);
                        ha->total_io_count++;
                        if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
                                break;
                }
        }

        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        return IRQ_HANDLED;
}

/**
 * qla4_82xx_intr_handler - hardware interrupt handler.
 * @irq: Unused
 * @dev_id: Pointer to host adapter structure
 **/
irqreturn_t qla4_82xx_intr_handler(int irq, void *dev_id)
{
        struct scsi_qla_host *ha = dev_id;
        uint32_t intr_status;
        uint32_t status;
        unsigned long flags = 0;
        uint8_t reqs_count = 0;

        if (unlikely(pci_channel_offline(ha->pdev)))
                return IRQ_HANDLED;

        ha->isr_count++;
        status = qla4_82xx_rd_32(ha, ISR_INT_VECTOR);
        if (!(status & ha->nx_legacy_intr.int_vec_bit))
                return IRQ_NONE;

        status = qla4_82xx_rd_32(ha, ISR_INT_STATE_REG);
        if (!ISR_IS_LEGACY_INTR_TRIGGERED(status)) {
                DEBUG7(ql4_printk(KERN_INFO, ha,
                                  "%s legacy Int not triggered\n", __func__));
                return IRQ_NONE;
        }

        /* clear the interrupt */
        qla4_82xx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);

        /* read twice to ensure write is flushed */
        qla4_82xx_rd_32(ha, ISR_INT_VECTOR);
        qla4_82xx_rd_32(ha, ISR_INT_VECTOR);

        spin_lock_irqsave(&ha->hardware_lock, flags);
        while (1) {
                if (!(readl(&ha->qla4_82xx_reg->host_int) &
                    ISRX_82XX_RISC_INT)) {
                        qla4_82xx_spurious_interrupt(ha, reqs_count);
                        break;
                }
                intr_status =  readl(&ha->qla4_82xx_reg->host_status);
                if ((intr_status &
                    (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0)  {
                        qla4_82xx_spurious_interrupt(ha, reqs_count);
                        break;
                }

                ha->isp_ops->interrupt_service_routine(ha, intr_status);

                /* Enable Interrupt */
                qla4_82xx_wr_32(ha, ha->nx_legacy_intr.tgt_mask_reg, 0xfbff);

                if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
                        break;
        }

        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return IRQ_HANDLED;
}

#define LEG_INT_PTR_B31         (1 << 31)
#define LEG_INT_PTR_B30         (1 << 30)
#define PF_BITS_MASK            (0xF << 16)

/**
 * qla4_83xx_intr_handler - hardware interrupt handler.
 * @irq: Unused
 * @dev_id: Pointer to host adapter structure
 **/
irqreturn_t qla4_83xx_intr_handler(int irq, void *dev_id)
{
        struct scsi_qla_host *ha = dev_id;
        uint32_t leg_int_ptr = 0;
        unsigned long flags = 0;

        ha->isr_count++;
        leg_int_ptr = readl(&ha->qla4_83xx_reg->leg_int_ptr);

        /* Legacy interrupt is valid if bit31 of leg_int_ptr is set */
        if (!(leg_int_ptr & LEG_INT_PTR_B31)) {
                DEBUG7(ql4_printk(KERN_ERR, ha,
                                  "%s: Legacy Interrupt Bit 31 not set, spurious interrupt!\n",
                                  __func__));
                return IRQ_NONE;
        }

        /* Validate the PCIE function ID set in leg_int_ptr bits [19..16] */
        if ((leg_int_ptr & PF_BITS_MASK) != ha->pf_bit) {
                DEBUG7(ql4_printk(KERN_ERR, ha,
                                  "%s: Incorrect function ID 0x%x in legacy interrupt register, ha->pf_bit = 0x%x\n",
                                  __func__, (leg_int_ptr & PF_BITS_MASK),
                                  ha->pf_bit));
                return IRQ_NONE;
        }

        /* To de-assert legacy interrupt, write 0 to Legacy Interrupt Trigger
         * Control register and poll till Legacy Interrupt Pointer register
         * bit30 is 0.
         */
        writel(0, &ha->qla4_83xx_reg->leg_int_trig);
        do {
                leg_int_ptr = readl(&ha->qla4_83xx_reg->leg_int_ptr);
                if ((leg_int_ptr & PF_BITS_MASK) != ha->pf_bit)
                        break;
        } while (leg_int_ptr & LEG_INT_PTR_B30);

        spin_lock_irqsave(&ha->hardware_lock, flags);
        leg_int_ptr = readl(&ha->qla4_83xx_reg->risc_intr);
        ha->isp_ops->interrupt_service_routine(ha, leg_int_ptr);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        return IRQ_HANDLED;
}

irqreturn_t
qla4_8xxx_msi_handler(int irq, void *dev_id)
{
        struct scsi_qla_host *ha;

        ha = (struct scsi_qla_host *) dev_id;
        if (!ha) {
                DEBUG2(printk(KERN_INFO
                    "qla4xxx: MSIX: Interrupt with NULL host ptr\n"));
                return IRQ_NONE;
        }

        ha->isr_count++;
        /* clear the interrupt */
        qla4_82xx_wr_32(ha, ha->nx_legacy_intr.tgt_status_reg, 0xffffffff);

        /* read twice to ensure write is flushed */
        qla4_82xx_rd_32(ha, ISR_INT_VECTOR);
        qla4_82xx_rd_32(ha, ISR_INT_VECTOR);

        return qla4_8xxx_default_intr_handler(irq, dev_id);
}

static irqreturn_t qla4_83xx_mailbox_intr_handler(int irq, void *dev_id)
{
        struct scsi_qla_host *ha = dev_id;
        unsigned long flags;
        uint32_t ival = 0;

        spin_lock_irqsave(&ha->hardware_lock, flags);

        ival = readl(&ha->qla4_83xx_reg->risc_intr);
        if (ival == 0) {
                ql4_printk(KERN_INFO, ha,
                           "%s: It is a spurious mailbox interrupt!\n",
                           __func__);
                ival = readl(&ha->qla4_83xx_reg->mb_int_mask);
                ival &= ~INT_MASK_FW_MB;
                writel(ival, &ha->qla4_83xx_reg->mb_int_mask);
                goto exit;
        }

        qla4xxx_isr_decode_mailbox(ha,
                                   readl(&ha->qla4_83xx_reg->mailbox_out[0]));
        writel(0, &ha->qla4_83xx_reg->risc_intr);
        ival = readl(&ha->qla4_83xx_reg->mb_int_mask);
        ival &= ~INT_MASK_FW_MB;
        writel(ival, &ha->qla4_83xx_reg->mb_int_mask);
        ha->isr_count++;
exit:
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return IRQ_HANDLED;
}

/**
 * qla4_8xxx_default_intr_handler - hardware interrupt handler.
 * @irq: Unused
 * @dev_id: Pointer to host adapter structure
 *
 * This interrupt handler is called directly for MSI-X, and
 * called indirectly for MSI.
 **/
irqreturn_t
qla4_8xxx_default_intr_handler(int irq, void *dev_id)
{
        struct scsi_qla_host *ha = dev_id;
        unsigned long   flags;
        uint32_t intr_status;
        uint8_t reqs_count = 0;

        if (is_qla8032(ha) || is_qla8042(ha)) {
                qla4_83xx_mailbox_intr_handler(irq, dev_id);
        } else {
                spin_lock_irqsave(&ha->hardware_lock, flags);
                while (1) {
                        if (!(readl(&ha->qla4_82xx_reg->host_int) &
                            ISRX_82XX_RISC_INT)) {
                                qla4_82xx_spurious_interrupt(ha, reqs_count);
                                break;
                        }

                        intr_status =  readl(&ha->qla4_82xx_reg->host_status);
                        if ((intr_status &
                            (HSRX_RISC_MB_INT | HSRX_RISC_IOCB_INT)) == 0) {
                                qla4_82xx_spurious_interrupt(ha, reqs_count);
                                break;
                        }

                        ha->isp_ops->interrupt_service_routine(ha, intr_status);

                        if (++reqs_count == MAX_REQS_SERVICED_PER_INTR)
                                break;
                }
                ha->isr_count++;
                spin_unlock_irqrestore(&ha->hardware_lock, flags);
        }
        return IRQ_HANDLED;
}

irqreturn_t
qla4_8xxx_msix_rsp_q(int irq, void *dev_id)
{
        struct scsi_qla_host *ha = dev_id;
        unsigned long flags;
        int intr_status;
        uint32_t ival = 0;

        spin_lock_irqsave(&ha->hardware_lock, flags);
        if (is_qla8032(ha) || is_qla8042(ha)) {
                ival = readl(&ha->qla4_83xx_reg->iocb_int_mask);
                if (ival == 0) {
                        ql4_printk(KERN_INFO, ha, "%s: It is a spurious iocb interrupt!\n",
                                   __func__);
                        goto exit_msix_rsp_q;
                }
                qla4xxx_process_response_queue(ha);
                writel(0, &ha->qla4_83xx_reg->iocb_int_mask);
        } else {
                intr_status = readl(&ha->qla4_82xx_reg->host_status);
                if (intr_status & HSRX_RISC_IOCB_INT) {
                        qla4xxx_process_response_queue(ha);
                        writel(0, &ha->qla4_82xx_reg->host_int);
                } else {
                        ql4_printk(KERN_INFO, ha, "%s: spurious iocb interrupt...\n",
                                   __func__);
                        goto exit_msix_rsp_q;
                }
        }
        ha->isr_count++;
exit_msix_rsp_q:
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return IRQ_HANDLED;
}

/**
 * qla4xxx_process_aen - processes AENs generated by firmware
 * @ha: pointer to host adapter structure.
 * @process_aen: type of AENs to process
 *
 * Processes specific types of Asynchronous Events generated by firmware.
 * The type of AENs to process is specified by process_aen and can be
 *      PROCESS_ALL_AENS         0
 *      FLUSH_DDB_CHANGED_AENS   1
 *      RELOGIN_DDB_CHANGED_AENS 2
 **/
void qla4xxx_process_aen(struct scsi_qla_host * ha, uint8_t process_aen)
{
        uint32_t mbox_sts[MBOX_AEN_REG_COUNT];
        struct aen *aen;
        int i;
        unsigned long flags;

        spin_lock_irqsave(&ha->hardware_lock, flags);
        while (ha->aen_out != ha->aen_in) {
                aen = &ha->aen_q[ha->aen_out];
                /* copy aen information to local structure */
                for (i = 0; i < MBOX_AEN_REG_COUNT; i++)
                        mbox_sts[i] = aen->mbox_sts[i];

                ha->aen_q_count++;
                ha->aen_out++;

                if (ha->aen_out == MAX_AEN_ENTRIES)
                        ha->aen_out = 0;

                spin_unlock_irqrestore(&ha->hardware_lock, flags);

                DEBUG2(printk("qla4xxx(%ld): AEN[%d]=0x%08x, mbx1=0x%08x mbx2=0x%08x"
                        " mbx3=0x%08x mbx4=0x%08x\n", ha->host_no,
                        (ha->aen_out ? (ha->aen_out-1): (MAX_AEN_ENTRIES-1)),
                        mbox_sts[0], mbox_sts[1], mbox_sts[2],
                        mbox_sts[3], mbox_sts[4]));

                switch (mbox_sts[0]) {
                case MBOX_ASTS_DATABASE_CHANGED:
                        switch (process_aen) {
                        case FLUSH_DDB_CHANGED_AENS:
                                DEBUG2(printk("scsi%ld: AEN[%d] %04x, index "
                                              "[%d] state=%04x FLUSHED!\n",
                                              ha->host_no, ha->aen_out,
                                              mbox_sts[0], mbox_sts[2],
                                              mbox_sts[3]));
                                break;
                        case PROCESS_ALL_AENS:
                        default:
                                /* Specific device. */
                                if (mbox_sts[1] == 1)
                                        qla4xxx_process_ddb_changed(ha,
                                                mbox_sts[2], mbox_sts[3],
                                                mbox_sts[4]);
                                break;
                        }
                }
                spin_lock_irqsave(&ha->hardware_lock, flags);
        }
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

int qla4xxx_request_irqs(struct scsi_qla_host *ha)
{
        int ret = 0;
        int rval = QLA_ERROR;

        if (is_qla40XX(ha))
                goto try_intx;

        if (ql4xenablemsix == 2) {
                /* Note: MSI Interrupts not supported for ISP8324 and ISP8042 */
                if (is_qla8032(ha) || is_qla8042(ha)) {
                        ql4_printk(KERN_INFO, ha, "%s: MSI Interrupts not supported for ISP%04x, Falling back-to INTx mode\n",
                                   __func__, ha->pdev->device);
                        goto try_intx;
                }
                goto try_msi;
        }

        if (ql4xenablemsix == 0 || ql4xenablemsix != 1)
                goto try_intx;

        /* Trying MSI-X */
        ret = qla4_8xxx_enable_msix(ha);
        if (!ret) {
                DEBUG2(ql4_printk(KERN_INFO, ha,
                    "MSI-X: Enabled (0x%X).\n", ha->revision_id));
                goto irq_attached;
        } else {
                if (is_qla8032(ha) || is_qla8042(ha)) {
                        ql4_printk(KERN_INFO, ha, "%s: ISP%04x: MSI-X: Falling back-to INTx mode. ret = %d\n",
                                   __func__, ha->pdev->device, ret);
                        goto try_intx;
                }
        }

        ql4_printk(KERN_WARNING, ha,
            "MSI-X: Falling back-to MSI mode -- %d.\n", ret);

try_msi:
        /* Trying MSI */
        ret = pci_alloc_irq_vectors(ha->pdev, 1, 1, PCI_IRQ_MSI);
        if (ret > 0) {
                ret = request_irq(ha->pdev->irq, qla4_8xxx_msi_handler,
                        0, DRIVER_NAME, ha);
                if (!ret) {
                        DEBUG2(ql4_printk(KERN_INFO, ha, "MSI: Enabled.\n"));
                        goto irq_attached;
                } else {
                        ql4_printk(KERN_WARNING, ha,
                            "MSI: Failed to reserve interrupt %d "
                            "already in use.\n", ha->pdev->irq);
                        pci_free_irq_vectors(ha->pdev);
                }
        }

try_intx:
        if (is_qla8022(ha)) {
                ql4_printk(KERN_WARNING, ha, "%s: ISP82xx Legacy interrupt not supported\n",
                           __func__);
                goto irq_not_attached;
        }

        /* Trying INTx */
        ret = request_irq(ha->pdev->irq, ha->isp_ops->intr_handler,
            IRQF_SHARED, DRIVER_NAME, ha);
        if (!ret) {
                DEBUG2(ql4_printk(KERN_INFO, ha, "INTx: Enabled.\n"));
                goto irq_attached;

        } else {
                ql4_printk(KERN_WARNING, ha,
                    "INTx: Failed to reserve interrupt %d already in"
                    " use.\n", ha->pdev->irq);
                goto irq_not_attached;
        }

irq_attached:
        set_bit(AF_IRQ_ATTACHED, &ha->flags);
        ha->host->irq = ha->pdev->irq;
        ql4_printk(KERN_INFO, ha, "%s: irq %d attached\n",
                   __func__, ha->pdev->irq);
        rval = QLA_SUCCESS;
irq_not_attached:
        return rval;
}

void qla4xxx_free_irqs(struct scsi_qla_host *ha)
{
        if (!test_and_clear_bit(AF_IRQ_ATTACHED, &ha->flags))
                return;

        if (ha->pdev->msix_enabled)
                free_irq(pci_irq_vector(ha->pdev, 1), ha);
        free_irq(pci_irq_vector(ha->pdev, 0), ha);
        pci_free_irq_vectors(ha->pdev);
}