qla_mid.c

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/*
 * QLogic Fibre Channel HBA Driver
 * Copyright (c)  2003-2012 QLogic Corporation
 *
 * See LICENSE.qla2xxx for copyright and licensing details.
 */
#include "qla_def.h"
#include "qla_gbl.h"
#include "qla_target.h"

#include <linux/moduleparam.h>
#include <linux/vmalloc.h>
#include <linux/slab.h>
#include <linux/list.h>

#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>
#include <linux/delay.h>

void
qla2x00_vp_stop_timer(scsi_qla_host_t *vha)
{
    if (vha->vp_idx && vha->timer_active) {
        del_timer_sync(&vha->timer);
        vha->timer_active = 0;
    }
}

static uint32_t
qla24xx_allocate_vp_id(scsi_qla_host_t *vha)
{
    uint32_t vp_id;
    struct qla_hw_data *ha = vha->hw;
    unsigned long flags;

    /* Find an empty slot and assign an vp_id */
    mutex_lock(&ha->vport_lock);
    vp_id = find_first_zero_bit(ha->vp_idx_map, ha->max_npiv_vports + 1);
    if (vp_id > ha->max_npiv_vports) {
        ql_dbg(ql_dbg_vport, vha, 0xa000,
            "vp_id %d is bigger than max-supported %d.\n",
            vp_id, ha->max_npiv_vports);
        mutex_unlock(&ha->vport_lock);
        return vp_id;
    }

    set_bit(vp_id, ha->vp_idx_map);
    ha->num_vhosts++;
    vha->vp_idx = vp_id;

    spin_lock_irqsave(&ha->vport_slock, flags);
    list_add_tail(&vha->list, &ha->vp_list);

    qlt_update_vp_map(vha, SET_VP_IDX);

    spin_unlock_irqrestore(&ha->vport_slock, flags);

    mutex_unlock(&ha->vport_lock);
    return vp_id;
}

void
qla24xx_deallocate_vp_id(scsi_qla_host_t *vha)
{
    uint16_t vp_id;
    struct qla_hw_data *ha = vha->hw;
    unsigned long flags = 0;

    mutex_lock(&ha->vport_lock);
    /*
     * Wait for all pending activities to finish before removing vport from
     * the list.
     * Lock needs to be held for safe removal from the list (it
     * ensures no active vp_list traversal while the vport is removed
     * from the queue)
     */
    spin_lock_irqsave(&ha->vport_slock, flags);
    while (atomic_read(&vha->vref_count)) {
        spin_unlock_irqrestore(&ha->vport_slock, flags);

        msleep(500);

        spin_lock_irqsave(&ha->vport_slock, flags);
    }
    list_del(&vha->list);
    qlt_update_vp_map(vha, RESET_VP_IDX);
    spin_unlock_irqrestore(&ha->vport_slock, flags);

    vp_id = vha->vp_idx;
    ha->num_vhosts--;
    clear_bit(vp_id, ha->vp_idx_map);

    mutex_unlock(&ha->vport_lock);
}

static scsi_qla_host_t *
qla24xx_find_vhost_by_name(struct qla_hw_data *ha, uint8_t *port_name)
{
    scsi_qla_host_t *vha;
    struct scsi_qla_host *tvha;
    unsigned long flags;

    spin_lock_irqsave(&ha->vport_slock, flags);
    /* Locate matching device in database. */
    list_for_each_entry_safe(vha, tvha, &ha->vp_list, list) {
        if (!memcmp(port_name, vha->port_name, WWN_SIZE)) {
            spin_unlock_irqrestore(&ha->vport_slock, flags);
            return vha;
        }
    }
    spin_unlock_irqrestore(&ha->vport_slock, flags);
    return NULL;
}

/*
 * qla2x00_mark_vp_devices_dead
 *  Updates fcport state when device goes offline.
 *
 * Input:
 *  ha = adapter block pointer.
 *  fcport = port structure pointer.
 *
 * Return:
 *  None.
 *
 * Context:
 */
static void
qla2x00_mark_vp_devices_dead(scsi_qla_host_t *vha)
{
    /*
     * !!! NOTE !!!
     * This function, if called in contexts other than vp create, disable
     * or delete, please make sure this is synchronized with the
     * delete thread.
     */
    fc_port_t *fcport;

    list_for_each_entry(fcport, &vha->vp_fcports, list) {
        ql_dbg(ql_dbg_vport, vha, 0xa001,
            "Marking port dead, loop_id=0x%04x : %x.\n",
            fcport->loop_id, fcport->vha->vp_idx);

        qla2x00_mark_device_lost(vha, fcport, 0, 0);
        qla2x00_set_fcport_state(fcport, FCS_UNCONFIGURED);
    }
}

int
qla24xx_disable_vp(scsi_qla_host_t *vha)
{
    unsigned long flags;
    int ret;

    ret = qla24xx_control_vp(vha, VCE_COMMAND_DISABLE_VPS_LOGO_ALL);
    atomic_set(&vha->loop_state, LOOP_DOWN);
    atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);

    /* Remove port id from vp target map */
    spin_lock_irqsave(&vha->hw->vport_slock, flags);
    qlt_update_vp_map(vha, RESET_AL_PA);
    spin_unlock_irqrestore(&vha->hw->vport_slock, flags);

    qla2x00_mark_vp_devices_dead(vha);
    atomic_set(&vha->vp_state, VP_FAILED);
    vha->flags.management_server_logged_in = 0;
    if (ret == QLA_SUCCESS) {
        fc_vport_set_state(vha->fc_vport, FC_VPORT_DISABLED);
    } else {
        fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
        return -1;
    }
    return 0;
}

int
qla24xx_enable_vp(scsi_qla_host_t *vha)
{
    int ret;
    struct qla_hw_data *ha = vha->hw;
    scsi_qla_host_t *base_vha = pci_get_drvdata(ha->pdev);

    /* Check if physical ha port is Up */
    if (atomic_read(&base_vha->loop_state) == LOOP_DOWN  ||
        atomic_read(&base_vha->loop_state) == LOOP_DEAD ||
        !(ha->current_topology & ISP_CFG_F)) {
        vha->vp_err_state =  VP_ERR_PORTDWN;
        fc_vport_set_state(vha->fc_vport, FC_VPORT_LINKDOWN);
        goto enable_failed;
    }

    /* Initialize the new vport unless it is a persistent port */
    mutex_lock(&ha->vport_lock);
    ret = qla24xx_modify_vp_config(vha);
    mutex_unlock(&ha->vport_lock);

    if (ret != QLA_SUCCESS) {
        fc_vport_set_state(vha->fc_vport, FC_VPORT_FAILED);
        goto enable_failed;
    }

    ql_dbg(ql_dbg_taskm, vha, 0x801a,
        "Virtual port with id: %d - Enabled.\n", vha->vp_idx);
    return 0;

enable_failed:
    ql_dbg(ql_dbg_taskm, vha, 0x801b,
        "Virtual port with id: %d - Disabled.\n", vha->vp_idx);
    return 1;
}

static void
qla24xx_configure_vp(scsi_qla_host_t *vha)
{
    struct fc_vport *fc_vport;
    int ret;

    fc_vport = vha->fc_vport;

    ql_dbg(ql_dbg_vport, vha, 0xa002,
        "%s: change request #3.\n", __func__);
    ret = qla2x00_send_change_request(vha, 0x3, vha->vp_idx);
    if (ret != QLA_SUCCESS) {
        ql_dbg(ql_dbg_vport, vha, 0xa003, "Failed to enable "
            "receiving of RSCN requests: 0x%x.\n", ret);
        return;
    } else {
        /* Corresponds to SCR enabled */
        clear_bit(VP_SCR_NEEDED, &vha->vp_flags);
    }

    vha->flags.online = 1;
    if (qla24xx_configure_vhba(vha))
        return;

    atomic_set(&vha->vp_state, VP_ACTIVE);
    fc_vport_set_state(fc_vport, FC_VPORT_ACTIVE);
}

void
qla2x00_alert_all_vps(struct rsp_que *rsp, uint16_t *mb)
{
    scsi_qla_host_t *vha;
    struct qla_hw_data *ha = rsp->hw;
    int i = 0;
    unsigned long flags;

    spin_lock_irqsave(&ha->vport_slock, flags);
    list_for_each_entry(vha, &ha->vp_list, list) {
        if (vha->vp_idx) {
            atomic_inc(&vha->vref_count);
            spin_unlock_irqrestore(&ha->vport_slock, flags);

            switch (mb[0]) {
            case MBA_LIP_OCCURRED:
            case MBA_LOOP_UP:
            case MBA_LOOP_DOWN:
            case MBA_LIP_RESET:
            case MBA_POINT_TO_POINT:
            case MBA_CHG_IN_CONNECTION:
            case MBA_PORT_UPDATE:
            case MBA_RSCN_UPDATE:
                ql_dbg(ql_dbg_async, vha, 0x5024,
                    "Async_event for VP[%d], mb=0x%x vha=%p.\n",
                    i, *mb, vha);
                qla2x00_async_event(vha, rsp, mb);
                break;
            }

            spin_lock_irqsave(&ha->vport_slock, flags);
            atomic_dec(&vha->vref_count);
        }
        i++;
    }
    spin_unlock_irqrestore(&ha->vport_slock, flags);
}

int
qla2x00_vp_abort_isp(scsi_qla_host_t *vha)
{
    /*
     * Physical port will do most of the abort and recovery work. We can
     * just treat it as a loop down
     */
    if (atomic_read(&vha->loop_state) != LOOP_DOWN) {
        atomic_set(&vha->loop_state, LOOP_DOWN);
        qla2x00_mark_all_devices_lost(vha, 0);
    } else {
        if (!atomic_read(&vha->loop_down_timer))
            atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);
    }

    /*
     * To exclusively reset vport, we need to log it out first.  Note: this
     * control_vp can fail if ISP reset is already issued, this is
     * expected, as the vp would be already logged out due to ISP reset.
     */
    if (!test_bit(ABORT_ISP_ACTIVE, &vha->dpc_flags))
        qla24xx_control_vp(vha, VCE_COMMAND_DISABLE_VPS_LOGO_ALL);

    ql_dbg(ql_dbg_taskm, vha, 0x801d,
        "Scheduling enable of Vport %d.\n", vha->vp_idx);
    return qla24xx_enable_vp(vha);
}

static int
qla2x00_do_dpc_vp(scsi_qla_host_t *vha)
{
    ql_dbg(ql_dbg_dpc + ql_dbg_verbose, vha, 0x4012,
        "Entering %s vp_flags: 0x%lx.\n", __func__, vha->vp_flags);

    qla2x00_do_work(vha);

    if (test_and_clear_bit(VP_IDX_ACQUIRED, &vha->vp_flags)) {
        /* VP acquired. complete port configuration */
        ql_dbg(ql_dbg_dpc, vha, 0x4014,
            "Configure VP scheduled.\n");
        qla24xx_configure_vp(vha);
        ql_dbg(ql_dbg_dpc, vha, 0x4015,
            "Configure VP end.\n");
        return 0;
    }

    if (test_bit(FCPORT_UPDATE_NEEDED, &vha->dpc_flags)) {
        ql_dbg(ql_dbg_dpc, vha, 0x4016,
            "FCPort update scheduled.\n");
        qla2x00_update_fcports(vha);
        clear_bit(FCPORT_UPDATE_NEEDED, &vha->dpc_flags);
        ql_dbg(ql_dbg_dpc, vha, 0x4017,
            "FCPort update end.\n");
    }

    if ((test_and_clear_bit(RELOGIN_NEEDED, &vha->dpc_flags)) &&
        !test_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags) &&
        atomic_read(&vha->loop_state) != LOOP_DOWN) {

        ql_dbg(ql_dbg_dpc, vha, 0x4018,
            "Relogin needed scheduled.\n");
        qla2x00_relogin(vha);
        ql_dbg(ql_dbg_dpc, vha, 0x4019,
            "Relogin needed end.\n");
    }

    if (test_and_clear_bit(RESET_MARKER_NEEDED, &vha->dpc_flags) &&
        (!(test_and_set_bit(RESET_ACTIVE, &vha->dpc_flags)))) {
        clear_bit(RESET_ACTIVE, &vha->dpc_flags);
    }

    if (test_and_clear_bit(LOOP_RESYNC_NEEDED, &vha->dpc_flags)) {
        if (!(test_and_set_bit(LOOP_RESYNC_ACTIVE, &vha->dpc_flags))) {
            ql_dbg(ql_dbg_dpc, vha, 0x401a,
                "Loop resync scheduled.\n");
            qla2x00_loop_resync(vha);
            clear_bit(LOOP_RESYNC_ACTIVE, &vha->dpc_flags);
            ql_dbg(ql_dbg_dpc, vha, 0x401b,
                "Loop resync end.\n");
        }
    }

    ql_dbg(ql_dbg_dpc + ql_dbg_verbose, vha, 0x401c,
        "Exiting %s.\n", __func__);
    return 0;
}

void
qla2x00_do_dpc_all_vps(scsi_qla_host_t *vha)
{
    int ret;
    struct qla_hw_data *ha = vha->hw;
    scsi_qla_host_t *vp;
    unsigned long flags = 0;

    if (vha->vp_idx)
        return;
    if (list_empty(&ha->vp_list))
        return;

    clear_bit(VP_DPC_NEEDED, &vha->dpc_flags);

    if (!(ha->current_topology & ISP_CFG_F))
        return;

    spin_lock_irqsave(&ha->vport_slock, flags);
    list_for_each_entry(vp, &ha->vp_list, list) {
        if (vp->vp_idx) {
            atomic_inc(&vp->vref_count);
            spin_unlock_irqrestore(&ha->vport_slock, flags);

            ret = qla2x00_do_dpc_vp(vp);

            spin_lock_irqsave(&ha->vport_slock, flags);
            atomic_dec(&vp->vref_count);
        }
    }
    spin_unlock_irqrestore(&ha->vport_slock, flags);
}

int
qla24xx_vport_create_req_sanity_check(struct fc_vport *fc_vport)
{
    scsi_qla_host_t *base_vha = shost_priv(fc_vport->shost);
    struct qla_hw_data *ha = base_vha->hw;
    scsi_qla_host_t *vha;
    uint8_t port_name[WWN_SIZE];

    if (fc_vport->roles != FC_PORT_ROLE_FCP_INITIATOR)
        return VPCERR_UNSUPPORTED;

    /* Check up the F/W and H/W support NPIV */
    if (!ha->flags.npiv_supported)
        return VPCERR_UNSUPPORTED;

    /* Check up whether npiv supported switch presented */
    if (!(ha->switch_cap & FLOGI_MID_SUPPORT))
        return VPCERR_NO_FABRIC_SUPP;

    /* Check up unique WWPN */
    u64_to_wwn(fc_vport->port_name, port_name);
    if (!memcmp(port_name, base_vha->port_name, WWN_SIZE))
        return VPCERR_BAD_WWN;
    vha = qla24xx_find_vhost_by_name(ha, port_name);
    if (vha)
        return VPCERR_BAD_WWN;

    /* Check up max-npiv-supports */
    if (ha->num_vhosts > ha->max_npiv_vports) {
        ql_dbg(ql_dbg_vport, vha, 0xa004,
            "num_vhosts %ud is bigger "
            "than max_npiv_vports %ud.\n",
            ha->num_vhosts, ha->max_npiv_vports);
        return VPCERR_UNSUPPORTED;
    }
    return 0;
}

scsi_qla_host_t *
qla24xx_create_vhost(struct fc_vport *fc_vport)
{
    scsi_qla_host_t *base_vha = shost_priv(fc_vport->shost);
    struct qla_hw_data *ha = base_vha->hw;
    scsi_qla_host_t *vha;
    struct scsi_host_template *sht = &qla2xxx_driver_template;
    struct Scsi_Host *host;

    vha = qla2x00_create_host(sht, ha);
    if (!vha) {
        ql_log(ql_log_warn, vha, 0xa005,
            "scsi_host_alloc() failed for vport.\n");
        return(NULL);
    }

    host = vha->host;
    fc_vport->dd_data = vha;
    /* New host info */
    u64_to_wwn(fc_vport->node_name, vha->node_name);
    u64_to_wwn(fc_vport->port_name, vha->port_name);

    vha->fc_vport = fc_vport;
    vha->device_flags = 0;
    vha->vp_idx = qla24xx_allocate_vp_id(vha);
    if (vha->vp_idx > ha->max_npiv_vports) {
        ql_dbg(ql_dbg_vport, vha, 0xa006,
            "Couldn't allocate vp_id.\n");
        goto create_vhost_failed;
    }
    vha->mgmt_svr_loop_id = 10 + vha->vp_idx;

    vha->dpc_flags = 0L;

    /*
     * To fix the issue of processing a parent's RSCN for the vport before
     * its SCR is complete.
     */
    set_bit(VP_SCR_NEEDED, &vha->vp_flags);
    atomic_set(&vha->loop_state, LOOP_DOWN);
    atomic_set(&vha->loop_down_timer, LOOP_DOWN_TIME);

    qla2x00_start_timer(vha, qla2x00_timer, WATCH_INTERVAL);

    vha->req = base_vha->req;
    host->can_queue = base_vha->req->length + 128;
    host->cmd_per_lun = 3;
    if (IS_T10_PI_CAPABLE(ha) && ql2xenabledif)
        host->max_cmd_len = 32;
    else
        host->max_cmd_len = MAX_CMDSZ;
    host->max_channel = MAX_BUSES - 1;
    host->max_lun = ql2xmaxlun;
    host->unique_id = host->host_no;
    host->max_id = ha->max_fibre_devices;
    host->transportt = qla2xxx_transport_vport_template;

    ql_dbg(ql_dbg_vport, vha, 0xa007,
        "Detect vport hba %ld at address = %p.\n",
        vha->host_no, vha);

    vha->flags.init_done = 1;

    mutex_lock(&ha->vport_lock);
    set_bit(vha->vp_idx, ha->vp_idx_map);
    ha->cur_vport_count++;
    mutex_unlock(&ha->vport_lock);

    return vha;

create_vhost_failed:
    return NULL;
}

static void
qla25xx_free_req_que(struct scsi_qla_host *vha, struct req_que *req)
{
    struct qla_hw_data *ha = vha->hw;
    uint16_t que_id = req->id;

    dma_free_coherent(&ha->pdev->dev, (req->length + 1) *
        sizeof(request_t), req->ring, req->dma);
    req->ring = NULL;
    req->dma = 0;
    if (que_id) {
        ha->req_q_map[que_id] = NULL;
        mutex_lock(&ha->vport_lock);
        clear_bit(que_id, ha->req_qid_map);
        mutex_unlock(&ha->vport_lock);
    }
    kfree(req);
    req = NULL;
}

static void
qla25xx_free_rsp_que(struct scsi_qla_host *vha, struct rsp_que *rsp)
{
    struct qla_hw_data *ha = vha->hw;
    uint16_t que_id = rsp->id;

    if (rsp->msix && rsp->msix->have_irq) {
        free_irq(rsp->msix->vector, rsp);
        rsp->msix->have_irq = 0;
        rsp->msix->rsp = NULL;
    }
    dma_free_coherent(&ha->pdev->dev, (rsp->length + 1) *
        sizeof(response_t), rsp->ring, rsp->dma);
    rsp->ring = NULL;
    rsp->dma = 0;
    if (que_id) {
        ha->rsp_q_map[que_id] = NULL;
        mutex_lock(&ha->vport_lock);
        clear_bit(que_id, ha->rsp_qid_map);
        mutex_unlock(&ha->vport_lock);
    }
    kfree(rsp);
    rsp = NULL;
}

int
qla25xx_delete_req_que(struct scsi_qla_host *vha, struct req_que *req)
{
    int ret = -1;

    if (req) {
        req->options |= BIT_0;
        ret = qla25xx_init_req_que(vha, req);
    }
    if (ret == QLA_SUCCESS)
        qla25xx_free_req_que(vha, req);

    return ret;
}

static int
qla25xx_delete_rsp_que(struct scsi_qla_host *vha, struct rsp_que *rsp)
{
    int ret = -1;

    if (rsp) {
        rsp->options |= BIT_0;
        ret = qla25xx_init_rsp_que(vha, rsp);
    }
    if (ret == QLA_SUCCESS)
        qla25xx_free_rsp_que(vha, rsp);

    return ret;
}

/* Delete all queues for a given vhost */
int
qla25xx_delete_queues(struct scsi_qla_host *vha)
{
    int cnt, ret = 0;
    struct req_que *req = NULL;
    struct rsp_que *rsp = NULL;
    struct qla_hw_data *ha = vha->hw;

    /* Delete request queues */
    for (cnt = 1; cnt < ha->max_req_queues; cnt++) {
        req = ha->req_q_map[cnt];
        if (req) {
            ret = qla25xx_delete_req_que(vha, req);
            if (ret != QLA_SUCCESS) {
                ql_log(ql_log_warn, vha, 0x00ea,
                    "Couldn't delete req que %d.\n",
                    req->id);
                return ret;
            }
        }
    }

    /* Delete response queues */
    for (cnt = 1; cnt < ha->max_rsp_queues; cnt++) {
        rsp = ha->rsp_q_map[cnt];
        if (rsp) {
            ret = qla25xx_delete_rsp_que(vha, rsp);
            if (ret != QLA_SUCCESS) {
                ql_log(ql_log_warn, vha, 0x00eb,
                    "Couldn't delete rsp que %d.\n",
                    rsp->id);
                return ret;
            }
        }
    }
    return ret;
}

int
qla25xx_create_req_que(struct qla_hw_data *ha, uint16_t options,
    uint8_t vp_idx, uint16_t rid, int rsp_que, uint8_t qos)
{
    int ret = 0;
    struct req_que *req = NULL;
    struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
    uint16_t que_id = 0;
    device_reg_t __iomem *reg;
    uint32_t cnt;

    req = kzalloc(sizeof(struct req_que), GFP_KERNEL);
    if (req == NULL) {
        ql_log(ql_log_fatal, base_vha, 0x00d9,
            "Failed to allocate memory for request queue.\n");
        goto failed;
    }

    req->length = REQUEST_ENTRY_CNT_24XX;
    req->ring = dma_alloc_coherent(&ha->pdev->dev,
            (req->length + 1) * sizeof(request_t),
            &req->dma, GFP_KERNEL);
    if (req->ring == NULL) {
        ql_log(ql_log_fatal, base_vha, 0x00da,
            "Failed to allocate memory for request_ring.\n");
        goto que_failed;
    }

    mutex_lock(&ha->vport_lock);
    que_id = find_first_zero_bit(ha->req_qid_map, ha->max_req_queues);
    if (que_id >= ha->max_req_queues) {
        mutex_unlock(&ha->vport_lock);
        ql_log(ql_log_warn, base_vha, 0x00db,
            "No resources to create additional request queue.\n");
        goto que_failed;
    }
    set_bit(que_id, ha->req_qid_map);
    ha->req_q_map[que_id] = req;
    req->rid = rid;
    req->vp_idx = vp_idx;
    req->qos = qos;

    ql_dbg(ql_dbg_multiq, base_vha, 0xc002,
        "queue_id=%d rid=%d vp_idx=%d qos=%d.\n",
        que_id, req->rid, req->vp_idx, req->qos);
    ql_dbg(ql_dbg_init, base_vha, 0x00dc,
        "queue_id=%d rid=%d vp_idx=%d qos=%d.\n",
        que_id, req->rid, req->vp_idx, req->qos);
    if (rsp_que < 0)
        req->rsp = NULL;
    else
        req->rsp = ha->rsp_q_map[rsp_que];
    /* Use alternate PCI bus number */
    if (MSB(req->rid))
        options |= BIT_4;
    /* Use alternate PCI devfn */
    if (LSB(req->rid))
        options |= BIT_5;
    req->options = options;

    ql_dbg(ql_dbg_multiq, base_vha, 0xc003,
        "options=0x%x.\n", req->options);
    ql_dbg(ql_dbg_init, base_vha, 0x00dd,
        "options=0x%x.\n", req->options);
    for (cnt = 1; cnt < MAX_OUTSTANDING_COMMANDS; cnt++)
        req->outstanding_cmds[cnt] = NULL;
    req->current_outstanding_cmd = 1;

    req->ring_ptr = req->ring;
    req->ring_index = 0;
    req->cnt = req->length;
    req->id = que_id;
    reg = ISP_QUE_REG(ha, que_id);
    req->max_q_depth = ha->req_q_map[0]->max_q_depth;
    mutex_unlock(&ha->vport_lock);
    ql_dbg(ql_dbg_multiq, base_vha, 0xc004,
        "ring_ptr=%p ring_index=%d, "
        "cnt=%d id=%d max_q_depth=%d.\n",
        req->ring_ptr, req->ring_index,
        req->cnt, req->id, req->max_q_depth);
    ql_dbg(ql_dbg_init, base_vha, 0x00de,
        "ring_ptr=%p ring_index=%d, "
        "cnt=%d id=%d max_q_depth=%d.\n",
        req->ring_ptr, req->ring_index, req->cnt,
        req->id, req->max_q_depth);

    ret = qla25xx_init_req_que(base_vha, req);
    if (ret != QLA_SUCCESS) {
        ql_log(ql_log_fatal, base_vha, 0x00df,
            "%s failed.\n", __func__);
        mutex_lock(&ha->vport_lock);
        clear_bit(que_id, ha->req_qid_map);
        mutex_unlock(&ha->vport_lock);
        goto que_failed;
    }

    return req->id;

que_failed:
    qla25xx_free_req_que(base_vha, req);
failed:
    return 0;
}

static void qla_do_work(struct work_struct *work)
{
    unsigned long flags;
    struct rsp_que *rsp = container_of(work, struct rsp_que, q_work);
    struct scsi_qla_host *vha;
    struct qla_hw_data *ha = rsp->hw;

    spin_lock_irqsave(&rsp->hw->hardware_lock, flags);
    vha = pci_get_drvdata(ha->pdev);
    qla24xx_process_response_queue(vha, rsp);
    spin_unlock_irqrestore(&rsp->hw->hardware_lock, flags);
}

/* create response queue */
int
qla25xx_create_rsp_que(struct qla_hw_data *ha, uint16_t options,
    uint8_t vp_idx, uint16_t rid, int req)
{
    int ret = 0;
    struct rsp_que *rsp = NULL;
    struct scsi_qla_host *base_vha = pci_get_drvdata(ha->pdev);
    uint16_t que_id = 0;
    device_reg_t __iomem *reg;

    rsp = kzalloc(sizeof(struct rsp_que), GFP_KERNEL);
    if (rsp == NULL) {
        ql_log(ql_log_warn, base_vha, 0x0066,
            "Failed to allocate memory for response queue.\n");
        goto failed;
    }

    rsp->length = RESPONSE_ENTRY_CNT_MQ;
    rsp->ring = dma_alloc_coherent(&ha->pdev->dev,
            (rsp->length + 1) * sizeof(response_t),
            &rsp->dma, GFP_KERNEL);
    if (rsp->ring == NULL) {
        ql_log(ql_log_warn, base_vha, 0x00e1,
            "Failed to allocate memory for response ring.\n");
        goto que_failed;
    }

    mutex_lock(&ha->vport_lock);
    que_id = find_first_zero_bit(ha->rsp_qid_map, ha->max_rsp_queues);
    if (que_id >= ha->max_rsp_queues) {
        mutex_unlock(&ha->vport_lock);
        ql_log(ql_log_warn, base_vha, 0x00e2,
            "No resources to create additional request queue.\n");
        goto que_failed;
    }
    set_bit(que_id, ha->rsp_qid_map);

    if (ha->flags.msix_enabled)
        rsp->msix = &ha->msix_entries[que_id + 1];
    else
        ql_log(ql_log_warn, base_vha, 0x00e3,
            "MSIX not enalbled.\n");

    ha->rsp_q_map[que_id] = rsp;
    rsp->rid = rid;
    rsp->vp_idx = vp_idx;
    rsp->hw = ha;
    ql_dbg(ql_dbg_init, base_vha, 0x00e4,
        "queue_id=%d rid=%d vp_idx=%d hw=%p.\n",
        que_id, rsp->rid, rsp->vp_idx, rsp->hw);
    /* Use alternate PCI bus number */
    if (MSB(rsp->rid))
        options |= BIT_4;
    /* Use alternate PCI devfn */
    if (LSB(rsp->rid))
        options |= BIT_5;
    /* Enable MSIX handshake mode on for uncapable adapters */
    if (!IS_MSIX_NACK_CAPABLE(ha))
        options |= BIT_6;

    rsp->options = options;
    rsp->id = que_id;
    reg = ISP_QUE_REG(ha, que_id);
    rsp->rsp_q_in = &reg->isp25mq.rsp_q_in;
    rsp->rsp_q_out = &reg->isp25mq.rsp_q_out;
    mutex_unlock(&ha->vport_lock);
    ql_dbg(ql_dbg_multiq, base_vha, 0xc00b,
        "options=%x id=%d rsp_q_in=%p rsp_q_out=%p",
        rsp->options, rsp->id, rsp->rsp_q_in,
        rsp->rsp_q_out);
    ql_dbg(ql_dbg_init, base_vha, 0x00e5,
        "options=%x id=%d rsp_q_in=%p rsp_q_out=%p",
        rsp->options, rsp->id, rsp->rsp_q_in,
        rsp->rsp_q_out);

    ret = qla25xx_request_irq(rsp);
    if (ret)
        goto que_failed;

    ret = qla25xx_init_rsp_que(base_vha, rsp);
    if (ret != QLA_SUCCESS) {
        ql_log(ql_log_fatal, base_vha, 0x00e7,
            "%s failed.\n", __func__);
        mutex_lock(&ha->vport_lock);
        clear_bit(que_id, ha->rsp_qid_map);
        mutex_unlock(&ha->vport_lock);
        goto que_failed;
    }
    if (req >= 0)
        rsp->req = ha->req_q_map[req];
    else
        rsp->req = NULL;

    qla2x00_init_response_q_entries(rsp);
    if (rsp->hw->wq)
        INIT_WORK(&rsp->q_work, qla_do_work);
    return rsp->id;

que_failed:
    qla25xx_free_rsp_que(base_vha, rsp);
failed:
    return 0;
}