qla_target.c

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/*
 *  qla_target.c SCSI LLD infrastructure for QLogic 22xx/23xx/24xx/25xx
 *
 *  based on qla2x00t.c code:
 *
 *  Copyright (C) 2004 - 2010 Vladislav Bolkhovitin <[email protected]>
 *  Copyright (C) 2004 - 2005 Leonid Stoljar
 *  Copyright (C) 2006 Nathaniel Clark <[email protected]>
 *  Copyright (C) 2006 - 2010 ID7 Ltd.
 *
 *  Forward port and refactoring to modern qla2xxx and target/configfs
 *
 *  Copyright (C) 2010-2011 Nicholas A. Bellinger <[email protected]>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation, version 2
 *  of the License.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU General Public License for more details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/list.h>
#include <linux/workqueue.h>
#include <asm/unaligned.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <target/target_core_base.h>
#include <target/target_core_fabric.h>

#include "qla_def.h"
#include "qla_target.h"

static char *qlini_mode = QLA2XXX_INI_MODE_STR_ENABLED;
module_param(qlini_mode, charp, S_IRUGO);
MODULE_PARM_DESC(qlini_mode,
    "Determines when initiator mode will be enabled. Possible values: "
    "\"exclusive\" - initiator mode will be enabled on load, "
    "disabled on enabling target mode and then on disabling target mode "
    "enabled back; "
    "\"disabled\" - initiator mode will never be enabled; "
    "\"enabled\" (default) - initiator mode will always stay enabled.");

static int ql2x_ini_mode = QLA2XXX_INI_MODE_EXCLUSIVE;

/*
 * From scsi/fc/fc_fcp.h
 */
enum fcp_resp_rsp_codes {
    FCP_TMF_CMPL = 0,
    FCP_DATA_LEN_INVALID = 1,
    FCP_CMND_FIELDS_INVALID = 2,
    FCP_DATA_PARAM_MISMATCH = 3,
    FCP_TMF_REJECTED = 4,
    FCP_TMF_FAILED = 5,
    FCP_TMF_INVALID_LUN = 9,
};

/*
 * fc_pri_ta from scsi/fc/fc_fcp.h
 */
#define FCP_PTA_SIMPLE      0   /* simple task attribute */
#define FCP_PTA_HEADQ       1   /* head of queue task attribute */
#define FCP_PTA_ORDERED     2   /* ordered task attribute */
#define FCP_PTA_ACA         4   /* auto. contigent allegiance */
#define FCP_PTA_MASK        7   /* mask for task attribute field */
#define FCP_PRI_SHIFT       3   /* priority field starts in bit 3 */
#define FCP_PRI_RESVD_MASK  0x80        /* reserved bits in priority field */

/*
 * This driver calls qla2x00_alloc_iocbs() and qla2x00_issue_marker(), which
 * must be called under HW lock and could unlock/lock it inside.
 * It isn't an issue, since in the current implementation on the time when
 * those functions are called:
 *
 *   - Either context is IRQ and only IRQ handler can modify HW data,
 *     including rings related fields,
 *
 *   - Or access to target mode variables from struct qla_tgt doesn't
 *     cross those functions boundaries, except tgt_stop, which
 *     additionally protected by irq_cmd_count.
 */
/* Predefs for callbacks handed to qla2xxx LLD */
static void qlt_24xx_atio_pkt(struct scsi_qla_host *ha,
    struct atio_from_isp *pkt);
static void qlt_response_pkt(struct scsi_qla_host *ha, response_t *pkt);
static int qlt_issue_task_mgmt(struct qla_tgt_sess *sess, uint32_t lun,
    int fn, void *iocb, int flags);
static void qlt_send_term_exchange(struct scsi_qla_host *ha, struct qla_tgt_cmd
    *cmd, struct atio_from_isp *atio, int ha_locked);
static void qlt_reject_free_srr_imm(struct scsi_qla_host *ha,
    struct qla_tgt_srr_imm *imm, int ha_lock);
/*
 * Global Variables
 */
static struct kmem_cache *qla_tgt_cmd_cachep;
static struct kmem_cache *qla_tgt_mgmt_cmd_cachep;
static mempool_t *qla_tgt_mgmt_cmd_mempool;
static struct workqueue_struct *qla_tgt_wq;
static DEFINE_MUTEX(qla_tgt_mutex);
static LIST_HEAD(qla_tgt_glist);

/* ha->hardware_lock supposed to be held on entry (to protect tgt->sess_list) */
static struct qla_tgt_sess *qlt_find_sess_by_port_name(
    struct qla_tgt *tgt,
    const uint8_t *port_name)
{
    struct qla_tgt_sess *sess;

    list_for_each_entry(sess, &tgt->sess_list, sess_list_entry) {
        if (!memcmp(sess->port_name, port_name, WWN_SIZE))
            return sess;
    }

    return NULL;
}

/* Might release hw lock, then reaquire!! */
static inline int qlt_issue_marker(struct scsi_qla_host *vha, int vha_locked)
{
    /* Send marker if required */
    if (unlikely(vha->marker_needed != 0)) {
        int rc = qla2x00_issue_marker(vha, vha_locked);
        if (rc != QLA_SUCCESS) {
            ql_dbg(ql_dbg_tgt, vha, 0xe03d,
                "qla_target(%d): issue_marker() failed\n",
                vha->vp_idx);
        }
        return rc;
    }
    return QLA_SUCCESS;
}

static inline
struct scsi_qla_host *qlt_find_host_by_d_id(struct scsi_qla_host *vha,
    uint8_t *d_id)
{
    struct qla_hw_data *ha = vha->hw;
    uint8_t vp_idx;

    if ((vha->d_id.b.area != d_id[1]) || (vha->d_id.b.domain != d_id[0]))
        return NULL;

    if (vha->d_id.b.al_pa == d_id[2])
        return vha;

    BUG_ON(ha->tgt.tgt_vp_map == NULL);
    vp_idx = ha->tgt.tgt_vp_map[d_id[2]].idx;
    if (likely(test_bit(vp_idx, ha->vp_idx_map)))
        return ha->tgt.tgt_vp_map[vp_idx].vha;

    return NULL;
}

static inline
struct scsi_qla_host *qlt_find_host_by_vp_idx(struct scsi_qla_host *vha,
    uint16_t vp_idx)
{
    struct qla_hw_data *ha = vha->hw;

    if (vha->vp_idx == vp_idx)
        return vha;

    BUG_ON(ha->tgt.tgt_vp_map == NULL);
    if (likely(test_bit(vp_idx, ha->vp_idx_map)))
        return ha->tgt.tgt_vp_map[vp_idx].vha;

    return NULL;
}

void qlt_24xx_atio_pkt_all_vps(struct scsi_qla_host *vha,
    struct atio_from_isp *atio)
{
    switch (atio->u.raw.entry_type) {
    case ATIO_TYPE7:
    {
        struct scsi_qla_host *host = qlt_find_host_by_d_id(vha,
            atio->u.isp24.fcp_hdr.d_id);
        if (unlikely(NULL == host)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe03e,
                "qla_target(%d): Received ATIO_TYPE7 "
                "with unknown d_id %x:%x:%x\n", vha->vp_idx,
                atio->u.isp24.fcp_hdr.d_id[0],
                atio->u.isp24.fcp_hdr.d_id[1],
                atio->u.isp24.fcp_hdr.d_id[2]);
            break;
        }
        qlt_24xx_atio_pkt(host, atio);
        break;
    }

    case IMMED_NOTIFY_TYPE:
    {
        struct scsi_qla_host *host = vha;
        struct imm_ntfy_from_isp *entry =
            (struct imm_ntfy_from_isp *)atio;

        if ((entry->u.isp24.vp_index != 0xFF) &&
            (entry->u.isp24.nport_handle != 0xFFFF)) {
            host = qlt_find_host_by_vp_idx(vha,
                entry->u.isp24.vp_index);
            if (unlikely(!host)) {
                ql_dbg(ql_dbg_tgt, vha, 0xe03f,
                    "qla_target(%d): Received "
                    "ATIO (IMMED_NOTIFY_TYPE) "
                    "with unknown vp_index %d\n",
                    vha->vp_idx, entry->u.isp24.vp_index);
                break;
            }
        }
        qlt_24xx_atio_pkt(host, atio);
        break;
    }

    default:
        ql_dbg(ql_dbg_tgt, vha, 0xe040,
            "qla_target(%d): Received unknown ATIO atio "
            "type %x\n", vha->vp_idx, atio->u.raw.entry_type);
        break;
    }

    return;
}

void qlt_response_pkt_all_vps(struct scsi_qla_host *vha, response_t *pkt)
{
    switch (pkt->entry_type) {
    case CTIO_TYPE7:
    {
        struct ctio7_from_24xx *entry = (struct ctio7_from_24xx *)pkt;
        struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
            entry->vp_index);
        if (unlikely(!host)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe041,
                "qla_target(%d): Response pkt (CTIO_TYPE7) "
                "received, with unknown vp_index %d\n",
                vha->vp_idx, entry->vp_index);
            break;
        }
        qlt_response_pkt(host, pkt);
        break;
    }

    case IMMED_NOTIFY_TYPE:
    {
        struct scsi_qla_host *host = vha;
        struct imm_ntfy_from_isp *entry =
            (struct imm_ntfy_from_isp *)pkt;

        host = qlt_find_host_by_vp_idx(vha, entry->u.isp24.vp_index);
        if (unlikely(!host)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe042,
                "qla_target(%d): Response pkt (IMMED_NOTIFY_TYPE) "
                "received, with unknown vp_index %d\n",
                vha->vp_idx, entry->u.isp24.vp_index);
            break;
        }
        qlt_response_pkt(host, pkt);
        break;
    }

    case NOTIFY_ACK_TYPE:
    {
        struct scsi_qla_host *host = vha;
        struct nack_to_isp *entry = (struct nack_to_isp *)pkt;

        if (0xFF != entry->u.isp24.vp_index) {
            host = qlt_find_host_by_vp_idx(vha,
                entry->u.isp24.vp_index);
            if (unlikely(!host)) {
                ql_dbg(ql_dbg_tgt, vha, 0xe043,
                    "qla_target(%d): Response "
                    "pkt (NOTIFY_ACK_TYPE) "
                    "received, with unknown "
                    "vp_index %d\n", vha->vp_idx,
                    entry->u.isp24.vp_index);
                break;
            }
        }
        qlt_response_pkt(host, pkt);
        break;
    }

    case ABTS_RECV_24XX:
    {
        struct abts_recv_from_24xx *entry =
            (struct abts_recv_from_24xx *)pkt;
        struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
            entry->vp_index);
        if (unlikely(!host)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe044,
                "qla_target(%d): Response pkt "
                "(ABTS_RECV_24XX) received, with unknown "
                "vp_index %d\n", vha->vp_idx, entry->vp_index);
            break;
        }
        qlt_response_pkt(host, pkt);
        break;
    }

    case ABTS_RESP_24XX:
    {
        struct abts_resp_to_24xx *entry =
            (struct abts_resp_to_24xx *)pkt;
        struct scsi_qla_host *host = qlt_find_host_by_vp_idx(vha,
            entry->vp_index);
        if (unlikely(!host)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe045,
                "qla_target(%d): Response pkt "
                "(ABTS_RECV_24XX) received, with unknown "
                "vp_index %d\n", vha->vp_idx, entry->vp_index);
            break;
        }
        qlt_response_pkt(host, pkt);
        break;
    }

    default:
        qlt_response_pkt(vha, pkt);
        break;
    }

}

static void qlt_free_session_done(struct work_struct *work)
{
    struct qla_tgt_sess *sess = container_of(work, struct qla_tgt_sess,
        free_work);
    struct qla_tgt *tgt = sess->tgt;
    struct scsi_qla_host *vha = sess->vha;
    struct qla_hw_data *ha = vha->hw;

    BUG_ON(!tgt);
    /*
     * Release the target session for FC Nexus from fabric module code.
     */
    if (sess->se_sess != NULL)
        ha->tgt.tgt_ops->free_session(sess);

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf001,
        "Unregistration of sess %p finished\n", sess);

    kfree(sess);
    /*
     * We need to protect against race, when tgt is freed before or
     * inside wake_up()
     */
    tgt->sess_count--;
    if (tgt->sess_count == 0)
        wake_up_all(&tgt->waitQ);
}

/* ha->hardware_lock supposed to be held on entry */
void qlt_unreg_sess(struct qla_tgt_sess *sess)
{
    struct scsi_qla_host *vha = sess->vha;

    vha->hw->tgt.tgt_ops->clear_nacl_from_fcport_map(sess);

    list_del(&sess->sess_list_entry);
    if (sess->deleted)
        list_del(&sess->del_list_entry);

    INIT_WORK(&sess->free_work, qlt_free_session_done);
    schedule_work(&sess->free_work);
}
EXPORT_SYMBOL(qlt_unreg_sess);

/* ha->hardware_lock supposed to be held on entry */
static int qlt_reset(struct scsi_qla_host *vha, void *iocb, int mcmd)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_sess *sess = NULL;
    uint32_t unpacked_lun, lun = 0;
    uint16_t loop_id;
    int res = 0;
    struct imm_ntfy_from_isp *n = (struct imm_ntfy_from_isp *)iocb;
    struct atio_from_isp *a = (struct atio_from_isp *)iocb;

    loop_id = le16_to_cpu(n->u.isp24.nport_handle);
    if (loop_id == 0xFFFF) {
#if 0 /* FIXME: Re-enable Global event handling.. */
        /* Global event */
        atomic_inc(&ha->tgt.qla_tgt->tgt_global_resets_count);
        qlt_clear_tgt_db(ha->tgt.qla_tgt, 1);
        if (!list_empty(&ha->tgt.qla_tgt->sess_list)) {
            sess = list_entry(ha->tgt.qla_tgt->sess_list.next,
                typeof(*sess), sess_list_entry);
            switch (mcmd) {
            case QLA_TGT_NEXUS_LOSS_SESS:
                mcmd = QLA_TGT_NEXUS_LOSS;
                break;
            case QLA_TGT_ABORT_ALL_SESS:
                mcmd = QLA_TGT_ABORT_ALL;
                break;
            case QLA_TGT_NEXUS_LOSS:
            case QLA_TGT_ABORT_ALL:
                break;
            default:
                ql_dbg(ql_dbg_tgt, vha, 0xe046,
                    "qla_target(%d): Not allowed "
                    "command %x in %s", vha->vp_idx,
                    mcmd, __func__);
                sess = NULL;
                break;
            }
        } else
            sess = NULL;
#endif
    } else {
        sess = ha->tgt.tgt_ops->find_sess_by_loop_id(vha, loop_id);
    }

    ql_dbg(ql_dbg_tgt, vha, 0xe000,
        "Using sess for qla_tgt_reset: %p\n", sess);
    if (!sess) {
        res = -ESRCH;
        return res;
    }

    ql_dbg(ql_dbg_tgt, vha, 0xe047,
        "scsi(%ld): resetting (session %p from port "
        "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x, "
        "mcmd %x, loop_id %d)\n", vha->host_no, sess,
        sess->port_name[0], sess->port_name[1],
        sess->port_name[2], sess->port_name[3],
        sess->port_name[4], sess->port_name[5],
        sess->port_name[6], sess->port_name[7],
        mcmd, loop_id);

    lun = a->u.isp24.fcp_cmnd.lun;
    unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);

    return qlt_issue_task_mgmt(sess, unpacked_lun, mcmd,
        iocb, QLA24XX_MGMT_SEND_NACK);
}

/* ha->hardware_lock supposed to be held on entry */
static void qlt_schedule_sess_for_deletion(struct qla_tgt_sess *sess,
    bool immediate)
{
    struct qla_tgt *tgt = sess->tgt;
    uint32_t dev_loss_tmo = tgt->ha->port_down_retry_count + 5;

    if (sess->deleted)
        return;

    ql_dbg(ql_dbg_tgt, sess->vha, 0xe001,
        "Scheduling sess %p for deletion\n", sess);
    list_add_tail(&sess->del_list_entry, &tgt->del_sess_list);
    sess->deleted = 1;

    if (immediate)
        dev_loss_tmo = 0;

    sess->expires = jiffies + dev_loss_tmo * HZ;

    ql_dbg(ql_dbg_tgt, sess->vha, 0xe048,
        "qla_target(%d): session for port %02x:%02x:%02x:"
        "%02x:%02x:%02x:%02x:%02x (loop ID %d) scheduled for "
        "deletion in %u secs (expires: %lu) immed: %d\n",
        sess->vha->vp_idx,
        sess->port_name[0], sess->port_name[1],
        sess->port_name[2], sess->port_name[3],
        sess->port_name[4], sess->port_name[5],
        sess->port_name[6], sess->port_name[7],
        sess->loop_id, dev_loss_tmo, sess->expires, immediate);

    if (immediate)
        schedule_delayed_work(&tgt->sess_del_work, 0);
    else
        schedule_delayed_work(&tgt->sess_del_work,
            jiffies - sess->expires);
}

/* ha->hardware_lock supposed to be held on entry */
static void qlt_clear_tgt_db(struct qla_tgt *tgt, bool local_only)
{
    struct qla_tgt_sess *sess;

    list_for_each_entry(sess, &tgt->sess_list, sess_list_entry)
        qlt_schedule_sess_for_deletion(sess, true);

    /* At this point tgt could be already dead */
}

static int qla24xx_get_loop_id(struct scsi_qla_host *vha, const uint8_t *s_id,
    uint16_t *loop_id)
{
    struct qla_hw_data *ha = vha->hw;
    dma_addr_t gid_list_dma;
    struct gid_list_info *gid_list;
    char *id_iter;
    int res, rc, i;
    uint16_t entries;

    gid_list = dma_alloc_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
        &gid_list_dma, GFP_KERNEL);
    if (!gid_list) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf044,
            "qla_target(%d): DMA Alloc failed of %u\n",
            vha->vp_idx, qla2x00_gid_list_size(ha));
        return -ENOMEM;
    }

    /* Get list of logged in devices */
    rc = qla2x00_get_id_list(vha, gid_list, gid_list_dma, &entries);
    if (rc != QLA_SUCCESS) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf045,
            "qla_target(%d): get_id_list() failed: %x\n",
            vha->vp_idx, rc);
        res = -1;
        goto out_free_id_list;
    }

    id_iter = (char *)gid_list;
    res = -1;
    for (i = 0; i < entries; i++) {
        struct gid_list_info *gid = (struct gid_list_info *)id_iter;
        if ((gid->al_pa == s_id[2]) &&
            (gid->area == s_id[1]) &&
            (gid->domain == s_id[0])) {
            *loop_id = le16_to_cpu(gid->loop_id);
            res = 0;
            break;
        }
        id_iter += ha->gid_list_info_size;
    }

out_free_id_list:
    dma_free_coherent(&ha->pdev->dev, qla2x00_gid_list_size(ha),
        gid_list, gid_list_dma);
    return res;
}

static bool qlt_check_fcport_exist(struct scsi_qla_host *vha,
    struct qla_tgt_sess *sess)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_port_24xx_data *pmap24;
    bool res, found = false;
    int rc, i;
    uint16_t loop_id = 0xFFFF; /* to eliminate compiler's warning */
    uint16_t entries;
    void *pmap;
    int pmap_len;
    fc_port_t *fcport;
    int global_resets;
    unsigned long flags;

retry:
    global_resets = atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count);

    rc = qla2x00_get_node_name_list(vha, &pmap, &pmap_len);
    if (rc != QLA_SUCCESS) {
        res = false;
        goto out;
    }

    pmap24 = pmap;
    entries = pmap_len/sizeof(*pmap24);

    for (i = 0; i < entries; ++i) {
        if (!memcmp(sess->port_name, pmap24[i].port_name, WWN_SIZE)) {
            loop_id = le16_to_cpu(pmap24[i].loop_id);
            found = true;
            break;
        }
    }

    kfree(pmap);

    if (!found) {
        res = false;
        goto out;
    }

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf046,
        "qlt_check_fcport_exist(): loop_id %d", loop_id);

    fcport = kzalloc(sizeof(*fcport), GFP_KERNEL);
    if (fcport == NULL) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf047,
            "qla_target(%d): Allocation of tmp FC port failed",
            vha->vp_idx);
        res = false;
        goto out;
    }

    fcport->loop_id = loop_id;

    rc = qla2x00_get_port_database(vha, fcport, 0);
    if (rc != QLA_SUCCESS) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf048,
            "qla_target(%d): Failed to retrieve fcport "
            "information -- get_port_database() returned %x "
            "(loop_id=0x%04x)", vha->vp_idx, rc, loop_id);
        res = false;
        goto out_free_fcport;
    }

    if (global_resets !=
        atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count)) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf002,
            "qla_target(%d): global reset during session discovery"
            " (counter was %d, new %d), retrying",
            vha->vp_idx, global_resets,
            atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count));
        goto retry;
    }

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf003,
        "Updating sess %p s_id %x:%x:%x, loop_id %d) to d_id %x:%x:%x, "
        "loop_id %d", sess, sess->s_id.b.domain, sess->s_id.b.al_pa,
        sess->s_id.b.area, sess->loop_id, fcport->d_id.b.domain,
        fcport->d_id.b.al_pa, fcport->d_id.b.area, fcport->loop_id);

    spin_lock_irqsave(&ha->hardware_lock, flags);
    ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id,
                (fcport->flags & FCF_CONF_COMP_SUPPORTED));
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    res = true;

out_free_fcport:
    kfree(fcport);

out:
    return res;
}

/* ha->hardware_lock supposed to be held on entry */
static void qlt_undelete_sess(struct qla_tgt_sess *sess)
{
    BUG_ON(!sess->deleted);

    list_del(&sess->del_list_entry);
    sess->deleted = 0;
}

static void qlt_del_sess_work_fn(struct delayed_work *work)
{
    struct qla_tgt *tgt = container_of(work, struct qla_tgt,
        sess_del_work);
    struct scsi_qla_host *vha = tgt->vha;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_sess *sess;
    unsigned long flags;

    spin_lock_irqsave(&ha->hardware_lock, flags);
    while (!list_empty(&tgt->del_sess_list)) {
        sess = list_entry(tgt->del_sess_list.next, typeof(*sess),
            del_list_entry);
        if (time_after_eq(jiffies, sess->expires)) {
            bool cancel;

            qlt_undelete_sess(sess);

            spin_unlock_irqrestore(&ha->hardware_lock, flags);
            cancel = qlt_check_fcport_exist(vha, sess);

            if (cancel) {
                if (sess->deleted) {
                    /*
                     * sess was again deleted while we were
                     * discovering it
                     */
                    spin_lock_irqsave(&ha->hardware_lock,
                        flags);
                    continue;
                }

                ql_dbg(ql_dbg_tgt_mgt, vha, 0xf049,
                    "qla_target(%d): cancel deletion of "
                    "session for port %02x:%02x:%02x:%02x:%02x:"
                    "%02x:%02x:%02x (loop ID %d), because "
                    " it isn't deleted by firmware",
                    vha->vp_idx, sess->port_name[0],
                    sess->port_name[1], sess->port_name[2],
                    sess->port_name[3], sess->port_name[4],
                    sess->port_name[5], sess->port_name[6],
                    sess->port_name[7], sess->loop_id);
            } else {
                ql_dbg(ql_dbg_tgt_mgt, vha, 0xf004,
                    "Timeout: sess %p about to be deleted\n",
                    sess);
                ha->tgt.tgt_ops->shutdown_sess(sess);
                ha->tgt.tgt_ops->put_sess(sess);
            }

            spin_lock_irqsave(&ha->hardware_lock, flags);
        } else {
            schedule_delayed_work(&tgt->sess_del_work,
                jiffies - sess->expires);
            break;
        }
    }
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

/*
 * Adds an extra ref to allow to drop hw lock after adding sess to the list.
 * Caller must put it.
 */
static struct qla_tgt_sess *qlt_create_sess(
    struct scsi_qla_host *vha,
    fc_port_t *fcport,
    bool local)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_sess *sess;
    unsigned long flags;
    unsigned char be_sid[3];

    /* Check to avoid double sessions */
    spin_lock_irqsave(&ha->hardware_lock, flags);
    list_for_each_entry(sess, &ha->tgt.qla_tgt->sess_list,
                sess_list_entry) {
        if (!memcmp(sess->port_name, fcport->port_name, WWN_SIZE)) {
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf005,
                "Double sess %p found (s_id %x:%x:%x, "
                "loop_id %d), updating to d_id %x:%x:%x, "
                "loop_id %d", sess, sess->s_id.b.domain,
                sess->s_id.b.al_pa, sess->s_id.b.area,
                sess->loop_id, fcport->d_id.b.domain,
                fcport->d_id.b.al_pa, fcport->d_id.b.area,
                fcport->loop_id);

            if (sess->deleted)
                qlt_undelete_sess(sess);

            kref_get(&sess->se_sess->sess_kref);
            ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id,
                        (fcport->flags & FCF_CONF_COMP_SUPPORTED));

            if (sess->local && !local)
                sess->local = 0;
            spin_unlock_irqrestore(&ha->hardware_lock, flags);

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

    sess = kzalloc(sizeof(*sess), GFP_KERNEL);
    if (!sess) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04a,
            "qla_target(%u): session allocation failed, "
            "all commands from port %02x:%02x:%02x:%02x:"
            "%02x:%02x:%02x:%02x will be refused", vha->vp_idx,
            fcport->port_name[0], fcport->port_name[1],
            fcport->port_name[2], fcport->port_name[3],
            fcport->port_name[4], fcport->port_name[5],
            fcport->port_name[6], fcport->port_name[7]);

        return NULL;
    }
    sess->tgt = ha->tgt.qla_tgt;
    sess->vha = vha;
    sess->s_id = fcport->d_id;
    sess->loop_id = fcport->loop_id;
    sess->local = local;

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf006,
        "Adding sess %p to tgt %p via ->check_initiator_node_acl()\n",
        sess, ha->tgt.qla_tgt);

    be_sid[0] = sess->s_id.b.domain;
    be_sid[1] = sess->s_id.b.area;
    be_sid[2] = sess->s_id.b.al_pa;
    /*
     * Determine if this fc_port->port_name is allowed to access
     * target mode using explict NodeACLs+MappedLUNs, or using
     * TPG demo mode.  If this is successful a target mode FC nexus
     * is created.
     */
    if (ha->tgt.tgt_ops->check_initiator_node_acl(vha,
        &fcport->port_name[0], sess, &be_sid[0], fcport->loop_id) < 0) {
        kfree(sess);
        return NULL;
    }
    /*
     * Take an extra reference to ->sess_kref here to handle qla_tgt_sess
     * access across ->hardware_lock reaquire.
     */
    kref_get(&sess->se_sess->sess_kref);

    sess->conf_compl_supported = (fcport->flags & FCF_CONF_COMP_SUPPORTED);
    BUILD_BUG_ON(sizeof(sess->port_name) != sizeof(fcport->port_name));
    memcpy(sess->port_name, fcport->port_name, sizeof(sess->port_name));

    spin_lock_irqsave(&ha->hardware_lock, flags);
    list_add_tail(&sess->sess_list_entry, &ha->tgt.qla_tgt->sess_list);
    ha->tgt.qla_tgt->sess_count++;
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04b,
        "qla_target(%d): %ssession for wwn %02x:%02x:%02x:%02x:"
        "%02x:%02x:%02x:%02x (loop_id %d, s_id %x:%x:%x, confirmed"
        " completion %ssupported) added\n",
        vha->vp_idx, local ?  "local " : "", fcport->port_name[0],
        fcport->port_name[1], fcport->port_name[2], fcport->port_name[3],
        fcport->port_name[4], fcport->port_name[5], fcport->port_name[6],
        fcport->port_name[7], fcport->loop_id, sess->s_id.b.domain,
        sess->s_id.b.area, sess->s_id.b.al_pa, sess->conf_compl_supported ?
        "" : "not ");

    return sess;
}

/*
 * Called from drivers/scsi/qla2xxx/qla_init.c:qla2x00_reg_remote_port()
 */
void qlt_fc_port_added(struct scsi_qla_host *vha, fc_port_t *fcport)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    struct qla_tgt_sess *sess;
    unsigned long flags;

    if (!vha->hw->tgt.tgt_ops)
        return;

    if (!tgt || (fcport->port_type != FCT_INITIATOR))
        return;

    spin_lock_irqsave(&ha->hardware_lock, flags);
    if (tgt->tgt_stop) {
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return;
    }
    sess = qlt_find_sess_by_port_name(tgt, fcport->port_name);
    if (!sess) {
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        mutex_lock(&ha->tgt.tgt_mutex);
        sess = qlt_create_sess(vha, fcport, false);
        mutex_unlock(&ha->tgt.tgt_mutex);

        spin_lock_irqsave(&ha->hardware_lock, flags);
    } else {
        kref_get(&sess->se_sess->sess_kref);

        if (sess->deleted) {
            qlt_undelete_sess(sess);

            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04c,
                "qla_target(%u): %ssession for port %02x:"
                "%02x:%02x:%02x:%02x:%02x:%02x:%02x (loop ID %d) "
                "reappeared\n", vha->vp_idx, sess->local ? "local "
                : "", sess->port_name[0], sess->port_name[1],
                sess->port_name[2], sess->port_name[3],
                sess->port_name[4], sess->port_name[5],
                sess->port_name[6], sess->port_name[7],
                sess->loop_id);

            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf007,
                "Reappeared sess %p\n", sess);
        }
        ha->tgt.tgt_ops->update_sess(sess, fcport->d_id, fcport->loop_id,
                    (fcport->flags & FCF_CONF_COMP_SUPPORTED));
    }

    if (sess && sess->local) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04d,
            "qla_target(%u): local session for "
            "port %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x "
            "(loop ID %d) became global\n", vha->vp_idx,
            fcport->port_name[0], fcport->port_name[1],
            fcport->port_name[2], fcport->port_name[3],
            fcport->port_name[4], fcport->port_name[5],
            fcport->port_name[6], fcport->port_name[7],
            sess->loop_id);
        sess->local = 0;
    }
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    ha->tgt.tgt_ops->put_sess(sess);
}

void qlt_fc_port_deleted(struct scsi_qla_host *vha, fc_port_t *fcport)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    struct qla_tgt_sess *sess;
    unsigned long flags;

    if (!vha->hw->tgt.tgt_ops)
        return;

    if (!tgt || (fcport->port_type != FCT_INITIATOR))
        return;

    spin_lock_irqsave(&ha->hardware_lock, flags);
    if (tgt->tgt_stop) {
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return;
    }
    sess = qlt_find_sess_by_port_name(tgt, fcport->port_name);
    if (!sess) {
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        return;
    }

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf008, "qla_tgt_fc_port_deleted %p", sess);

    sess->local = 1;
    qlt_schedule_sess_for_deletion(sess, false);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

static inline int test_tgt_sess_count(struct qla_tgt *tgt)
{
    struct qla_hw_data *ha = tgt->ha;
    unsigned long flags;
    int res;
    /*
     * We need to protect against race, when tgt is freed before or
     * inside wake_up()
     */
    spin_lock_irqsave(&ha->hardware_lock, flags);
    ql_dbg(ql_dbg_tgt, tgt->vha, 0xe002,
        "tgt %p, empty(sess_list)=%d sess_count=%d\n",
        tgt, list_empty(&tgt->sess_list), tgt->sess_count);
    res = (tgt->sess_count == 0);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    return res;
}

/* Called by tcm_qla2xxx configfs code */
void qlt_stop_phase1(struct qla_tgt *tgt)
{
    struct scsi_qla_host *vha = tgt->vha;
    struct qla_hw_data *ha = tgt->ha;
    unsigned long flags;

    if (tgt->tgt_stop || tgt->tgt_stopped) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf04e,
            "Already in tgt->tgt_stop or tgt_stopped state\n");
        dump_stack();
        return;
    }

    ql_dbg(ql_dbg_tgt, vha, 0xe003, "Stopping target for host %ld(%p)\n",
        vha->host_no, vha);
    /*
     * Mutex needed to sync with qla_tgt_fc_port_[added,deleted].
     * Lock is needed, because we still can get an incoming packet.
     */
    mutex_lock(&ha->tgt.tgt_mutex);
    spin_lock_irqsave(&ha->hardware_lock, flags);
    tgt->tgt_stop = 1;
    qlt_clear_tgt_db(tgt, true);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
    mutex_unlock(&ha->tgt.tgt_mutex);

    flush_delayed_work(&tgt->sess_del_work);

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf009,
        "Waiting for sess works (tgt %p)", tgt);
    spin_lock_irqsave(&tgt->sess_work_lock, flags);
    while (!list_empty(&tgt->sess_works_list)) {
        spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
        flush_scheduled_work();
        spin_lock_irqsave(&tgt->sess_work_lock, flags);
    }
    spin_unlock_irqrestore(&tgt->sess_work_lock, flags);

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00a,
        "Waiting for tgt %p: list_empty(sess_list)=%d "
        "sess_count=%d\n", tgt, list_empty(&tgt->sess_list),
        tgt->sess_count);

    wait_event(tgt->waitQ, test_tgt_sess_count(tgt));

    /* Big hammer */
    if (!ha->flags.host_shutting_down && qla_tgt_mode_enabled(vha))
        qlt_disable_vha(vha);

    /* Wait for sessions to clear out (just in case) */
    wait_event(tgt->waitQ, test_tgt_sess_count(tgt));
}
EXPORT_SYMBOL(qlt_stop_phase1);

/* Called by tcm_qla2xxx configfs code */
void qlt_stop_phase2(struct qla_tgt *tgt)
{
    struct qla_hw_data *ha = tgt->ha;
    unsigned long flags;

    if (tgt->tgt_stopped) {
        ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf04f,
            "Already in tgt->tgt_stopped state\n");
        dump_stack();
        return;
    }

    ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00b,
        "Waiting for %d IRQ commands to complete (tgt %p)",
        tgt->irq_cmd_count, tgt);

    mutex_lock(&ha->tgt.tgt_mutex);
    spin_lock_irqsave(&ha->hardware_lock, flags);
    while (tgt->irq_cmd_count != 0) {
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        udelay(2);
        spin_lock_irqsave(&ha->hardware_lock, flags);
    }
    tgt->tgt_stop = 0;
    tgt->tgt_stopped = 1;
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
    mutex_unlock(&ha->tgt.tgt_mutex);

    ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00c, "Stop of tgt %p finished",
        tgt);
}
EXPORT_SYMBOL(qlt_stop_phase2);

/* Called from qlt_remove_target() -> qla2x00_remove_one() */
void qlt_release(struct qla_tgt *tgt)
{
    struct qla_hw_data *ha = tgt->ha;

    if ((ha->tgt.qla_tgt != NULL) && !tgt->tgt_stopped)
        qlt_stop_phase2(tgt);

    ha->tgt.qla_tgt = NULL;

    ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00d,
        "Release of tgt %p finished\n", tgt);

    kfree(tgt);
}

/* ha->hardware_lock supposed to be held on entry */
static int qlt_sched_sess_work(struct qla_tgt *tgt, int type,
    const void *param, unsigned int param_size)
{
    struct qla_tgt_sess_work_param *prm;
    unsigned long flags;

    prm = kzalloc(sizeof(*prm), GFP_ATOMIC);
    if (!prm) {
        ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf050,
            "qla_target(%d): Unable to create session "
            "work, command will be refused", 0);
        return -ENOMEM;
    }

    ql_dbg(ql_dbg_tgt_mgt, tgt->vha, 0xf00e,
        "Scheduling work (type %d, prm %p)"
        " to find session for param %p (size %d, tgt %p)\n",
        type, prm, param, param_size, tgt);

    prm->type = type;
    memcpy(&prm->tm_iocb, param, param_size);

    spin_lock_irqsave(&tgt->sess_work_lock, flags);
    list_add_tail(&prm->sess_works_list_entry, &tgt->sess_works_list);
    spin_unlock_irqrestore(&tgt->sess_work_lock, flags);

    schedule_work(&tgt->sess_work);

    return 0;
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_send_notify_ack(struct scsi_qla_host *vha,
    struct imm_ntfy_from_isp *ntfy,
    uint32_t add_flags, uint16_t resp_code, int resp_code_valid,
    uint16_t srr_flags, uint16_t srr_reject_code, uint8_t srr_explan)
{
    struct qla_hw_data *ha = vha->hw;
    request_t *pkt;
    struct nack_to_isp *nack;

    ql_dbg(ql_dbg_tgt, vha, 0xe004, "Sending NOTIFY_ACK (ha=%p)\n", ha);

    /* Send marker if required */
    if (qlt_issue_marker(vha, 1) != QLA_SUCCESS)
        return;

    pkt = (request_t *)qla2x00_alloc_iocbs(vha, NULL);
    if (!pkt) {
        ql_dbg(ql_dbg_tgt, vha, 0xe049,
            "qla_target(%d): %s failed: unable to allocate "
            "request packet\n", vha->vp_idx, __func__);
        return;
    }

    if (ha->tgt.qla_tgt != NULL)
        ha->tgt.qla_tgt->notify_ack_expected++;

    pkt->entry_type = NOTIFY_ACK_TYPE;
    pkt->entry_count = 1;

    nack = (struct nack_to_isp *)pkt;
    nack->ox_id = ntfy->ox_id;

    nack->u.isp24.nport_handle = ntfy->u.isp24.nport_handle;
    if (le16_to_cpu(ntfy->u.isp24.status) == IMM_NTFY_ELS) {
        nack->u.isp24.flags = ntfy->u.isp24.flags &
            __constant_cpu_to_le32(NOTIFY24XX_FLAGS_PUREX_IOCB);
    }
    nack->u.isp24.srr_rx_id = ntfy->u.isp24.srr_rx_id;
    nack->u.isp24.status = ntfy->u.isp24.status;
    nack->u.isp24.status_subcode = ntfy->u.isp24.status_subcode;
    nack->u.isp24.exchange_address = ntfy->u.isp24.exchange_address;
    nack->u.isp24.srr_rel_offs = ntfy->u.isp24.srr_rel_offs;
    nack->u.isp24.srr_ui = ntfy->u.isp24.srr_ui;
    nack->u.isp24.srr_flags = cpu_to_le16(srr_flags);
    nack->u.isp24.srr_reject_code = srr_reject_code;
    nack->u.isp24.srr_reject_code_expl = srr_explan;
    nack->u.isp24.vp_index = ntfy->u.isp24.vp_index;

    ql_dbg(ql_dbg_tgt, vha, 0xe005,
        "qla_target(%d): Sending 24xx Notify Ack %d\n",
        vha->vp_idx, nack->u.isp24.status);

    qla2x00_start_iocbs(vha, vha->req);
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_24xx_send_abts_resp(struct scsi_qla_host *vha,
    struct abts_recv_from_24xx *abts, uint32_t status,
    bool ids_reversed)
{
    struct qla_hw_data *ha = vha->hw;
    struct abts_resp_to_24xx *resp;
    uint32_t f_ctl;
    uint8_t *p;

    ql_dbg(ql_dbg_tgt, vha, 0xe006,
        "Sending task mgmt ABTS response (ha=%p, atio=%p, status=%x\n",
        ha, abts, status);

    /* Send marker if required */
    if (qlt_issue_marker(vha, 1) != QLA_SUCCESS)
        return;

    resp = (struct abts_resp_to_24xx *)qla2x00_alloc_iocbs(vha, NULL);
    if (!resp) {
        ql_dbg(ql_dbg_tgt, vha, 0xe04a,
            "qla_target(%d): %s failed: unable to allocate "
            "request packet", vha->vp_idx, __func__);
        return;
    }

    resp->entry_type = ABTS_RESP_24XX;
    resp->entry_count = 1;
    resp->nport_handle = abts->nport_handle;
    resp->vp_index = vha->vp_idx;
    resp->sof_type = abts->sof_type;
    resp->exchange_address = abts->exchange_address;
    resp->fcp_hdr_le = abts->fcp_hdr_le;
    f_ctl = __constant_cpu_to_le32(F_CTL_EXCH_CONTEXT_RESP |
        F_CTL_LAST_SEQ | F_CTL_END_SEQ |
        F_CTL_SEQ_INITIATIVE);
    p = (uint8_t *)&f_ctl;
    resp->fcp_hdr_le.f_ctl[0] = *p++;
    resp->fcp_hdr_le.f_ctl[1] = *p++;
    resp->fcp_hdr_le.f_ctl[2] = *p;
    if (ids_reversed) {
        resp->fcp_hdr_le.d_id[0] = abts->fcp_hdr_le.d_id[0];
        resp->fcp_hdr_le.d_id[1] = abts->fcp_hdr_le.d_id[1];
        resp->fcp_hdr_le.d_id[2] = abts->fcp_hdr_le.d_id[2];
        resp->fcp_hdr_le.s_id[0] = abts->fcp_hdr_le.s_id[0];
        resp->fcp_hdr_le.s_id[1] = abts->fcp_hdr_le.s_id[1];
        resp->fcp_hdr_le.s_id[2] = abts->fcp_hdr_le.s_id[2];
    } else {
        resp->fcp_hdr_le.d_id[0] = abts->fcp_hdr_le.s_id[0];
        resp->fcp_hdr_le.d_id[1] = abts->fcp_hdr_le.s_id[1];
        resp->fcp_hdr_le.d_id[2] = abts->fcp_hdr_le.s_id[2];
        resp->fcp_hdr_le.s_id[0] = abts->fcp_hdr_le.d_id[0];
        resp->fcp_hdr_le.s_id[1] = abts->fcp_hdr_le.d_id[1];
        resp->fcp_hdr_le.s_id[2] = abts->fcp_hdr_le.d_id[2];
    }
    resp->exchange_addr_to_abort = abts->exchange_addr_to_abort;
    if (status == FCP_TMF_CMPL) {
        resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_ACC;
        resp->payload.ba_acct.seq_id_valid = SEQ_ID_INVALID;
        resp->payload.ba_acct.low_seq_cnt = 0x0000;
        resp->payload.ba_acct.high_seq_cnt = 0xFFFF;
        resp->payload.ba_acct.ox_id = abts->fcp_hdr_le.ox_id;
        resp->payload.ba_acct.rx_id = abts->fcp_hdr_le.rx_id;
    } else {
        resp->fcp_hdr_le.r_ctl = R_CTL_BASIC_LINK_SERV | R_CTL_B_RJT;
        resp->payload.ba_rjt.reason_code =
            BA_RJT_REASON_CODE_UNABLE_TO_PERFORM;
        /* Other bytes are zero */
    }

    ha->tgt.qla_tgt->abts_resp_expected++;

    qla2x00_start_iocbs(vha, vha->req);
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_24xx_retry_term_exchange(struct scsi_qla_host *vha,
    struct abts_resp_from_24xx_fw *entry)
{
    struct ctio7_to_24xx *ctio;

    ql_dbg(ql_dbg_tgt, vha, 0xe007,
        "Sending retry TERM EXCH CTIO7 (ha=%p)\n", vha->hw);
    /* Send marker if required */
    if (qlt_issue_marker(vha, 1) != QLA_SUCCESS)
        return;

    ctio = (struct ctio7_to_24xx *)qla2x00_alloc_iocbs(vha, NULL);
    if (ctio == NULL) {
        ql_dbg(ql_dbg_tgt, vha, 0xe04b,
            "qla_target(%d): %s failed: unable to allocate "
            "request packet\n", vha->vp_idx, __func__);
        return;
    }

    /*
     * We've got on entrance firmware's response on by us generated
     * ABTS response. So, in it ID fields are reversed.
     */

    ctio->entry_type = CTIO_TYPE7;
    ctio->entry_count = 1;
    ctio->nport_handle = entry->nport_handle;
    ctio->handle = QLA_TGT_SKIP_HANDLE |    CTIO_COMPLETION_HANDLE_MARK;
    ctio->timeout = __constant_cpu_to_le16(QLA_TGT_TIMEOUT);
    ctio->vp_index = vha->vp_idx;
    ctio->initiator_id[0] = entry->fcp_hdr_le.d_id[0];
    ctio->initiator_id[1] = entry->fcp_hdr_le.d_id[1];
    ctio->initiator_id[2] = entry->fcp_hdr_le.d_id[2];
    ctio->exchange_addr = entry->exchange_addr_to_abort;
    ctio->u.status1.flags =
        __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1 |
        CTIO7_FLAGS_TERMINATE);
    ctio->u.status1.ox_id = entry->fcp_hdr_le.ox_id;

    qla2x00_start_iocbs(vha, vha->req);

    qlt_24xx_send_abts_resp(vha, (struct abts_recv_from_24xx *)entry,
        FCP_TMF_CMPL, true);
}

/* ha->hardware_lock supposed to be held on entry */
static int __qlt_24xx_handle_abts(struct scsi_qla_host *vha,
    struct abts_recv_from_24xx *abts, struct qla_tgt_sess *sess)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_mgmt_cmd *mcmd;
    int rc;

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf00f,
        "qla_target(%d): task abort (tag=%d)\n",
        vha->vp_idx, abts->exchange_addr_to_abort);

    mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
    if (mcmd == NULL) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf051,
            "qla_target(%d): %s: Allocation of ABORT cmd failed",
            vha->vp_idx, __func__);
        return -ENOMEM;
    }
    memset(mcmd, 0, sizeof(*mcmd));

    mcmd->sess = sess;
    memcpy(&mcmd->orig_iocb.abts, abts, sizeof(mcmd->orig_iocb.abts));

    rc = ha->tgt.tgt_ops->handle_tmr(mcmd, 0, TMR_ABORT_TASK,
        abts->exchange_addr_to_abort);
    if (rc != 0) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf052,
            "qla_target(%d):  tgt_ops->handle_tmr()"
            " failed: %d", vha->vp_idx, rc);
        mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
        return -EFAULT;
    }

    return 0;
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_24xx_handle_abts(struct scsi_qla_host *vha,
    struct abts_recv_from_24xx *abts)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_sess *sess;
    uint32_t tag = abts->exchange_addr_to_abort;
    uint8_t s_id[3];
    int rc;

    if (le32_to_cpu(abts->fcp_hdr_le.parameter) & ABTS_PARAM_ABORT_SEQ) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf053,
            "qla_target(%d): ABTS: Abort Sequence not "
            "supported\n", vha->vp_idx);
        qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
        return;
    }

    if (tag == ATIO_EXCHANGE_ADDRESS_UNKNOWN) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf010,
            "qla_target(%d): ABTS: Unknown Exchange "
            "Address received\n", vha->vp_idx);
        qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
        return;
    }

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf011,
        "qla_target(%d): task abort (s_id=%x:%x:%x, "
        "tag=%d, param=%x)\n", vha->vp_idx, abts->fcp_hdr_le.s_id[2],
        abts->fcp_hdr_le.s_id[1], abts->fcp_hdr_le.s_id[0], tag,
        le32_to_cpu(abts->fcp_hdr_le.parameter));

    s_id[0] = abts->fcp_hdr_le.s_id[2];
    s_id[1] = abts->fcp_hdr_le.s_id[1];
    s_id[2] = abts->fcp_hdr_le.s_id[0];

    sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha, s_id);
    if (!sess) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf012,
            "qla_target(%d): task abort for non-existant session\n",
            vha->vp_idx);
        rc = qlt_sched_sess_work(ha->tgt.qla_tgt,
            QLA_TGT_SESS_WORK_ABORT, abts, sizeof(*abts));
        if (rc != 0) {
            qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED,
                false);
        }
        return;
    }

    rc = __qlt_24xx_handle_abts(vha, abts, sess);
    if (rc != 0) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf054,
            "qla_target(%d): __qlt_24xx_handle_abts() failed: %d\n",
            vha->vp_idx, rc);
        qlt_24xx_send_abts_resp(vha, abts, FCP_TMF_REJECTED, false);
        return;
    }
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_24xx_send_task_mgmt_ctio(struct scsi_qla_host *ha,
    struct qla_tgt_mgmt_cmd *mcmd, uint32_t resp_code)
{
    struct atio_from_isp *atio = &mcmd->orig_iocb.atio;
    struct ctio7_to_24xx *ctio;

    ql_dbg(ql_dbg_tgt, ha, 0xe008,
        "Sending task mgmt CTIO7 (ha=%p, atio=%p, resp_code=%x\n",
        ha, atio, resp_code);

    /* Send marker if required */
    if (qlt_issue_marker(ha, 1) != QLA_SUCCESS)
        return;

    ctio = (struct ctio7_to_24xx *)qla2x00_alloc_iocbs(ha, NULL);
    if (ctio == NULL) {
        ql_dbg(ql_dbg_tgt, ha, 0xe04c,
            "qla_target(%d): %s failed: unable to allocate "
            "request packet\n", ha->vp_idx, __func__);
        return;
    }

    ctio->entry_type = CTIO_TYPE7;
    ctio->entry_count = 1;
    ctio->handle = QLA_TGT_SKIP_HANDLE | CTIO_COMPLETION_HANDLE_MARK;
    ctio->nport_handle = mcmd->sess->loop_id;
    ctio->timeout = __constant_cpu_to_le16(QLA_TGT_TIMEOUT);
    ctio->vp_index = ha->vp_idx;
    ctio->initiator_id[0] = atio->u.isp24.fcp_hdr.s_id[2];
    ctio->initiator_id[1] = atio->u.isp24.fcp_hdr.s_id[1];
    ctio->initiator_id[2] = atio->u.isp24.fcp_hdr.s_id[0];
    ctio->exchange_addr = atio->u.isp24.exchange_addr;
    ctio->u.status1.flags = (atio->u.isp24.attr << 9) |
        __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1 |
        CTIO7_FLAGS_SEND_STATUS);
    ctio->u.status1.ox_id = swab16(atio->u.isp24.fcp_hdr.ox_id);
    ctio->u.status1.scsi_status =
        __constant_cpu_to_le16(SS_RESPONSE_INFO_LEN_VALID);
    ctio->u.status1.response_len = __constant_cpu_to_le16(8);
    ctio->u.status1.sense_data[0] = resp_code;

    qla2x00_start_iocbs(ha, ha->req);
}

void qlt_free_mcmd(struct qla_tgt_mgmt_cmd *mcmd)
{
    mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
}
EXPORT_SYMBOL(qlt_free_mcmd);

/* callback from target fabric module code */
void qlt_xmit_tm_rsp(struct qla_tgt_mgmt_cmd *mcmd)
{
    struct scsi_qla_host *vha = mcmd->sess->vha;
    struct qla_hw_data *ha = vha->hw;
    unsigned long flags;

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf013,
        "TM response mcmd (%p) status %#x state %#x",
        mcmd, mcmd->fc_tm_rsp, mcmd->flags);

    spin_lock_irqsave(&ha->hardware_lock, flags);
    if (mcmd->flags == QLA24XX_MGMT_SEND_NACK)
        qlt_send_notify_ack(vha, &mcmd->orig_iocb.imm_ntfy,
            0, 0, 0, 0, 0, 0);
    else {
        if (mcmd->se_cmd.se_tmr_req->function == TMR_ABORT_TASK)
            qlt_24xx_send_abts_resp(vha, &mcmd->orig_iocb.abts,
                mcmd->fc_tm_rsp, false);
        else
            qlt_24xx_send_task_mgmt_ctio(vha, mcmd,
                mcmd->fc_tm_rsp);
    }
    /*
     * Make the callback for ->free_mcmd() to queue_work() and invoke
     * target_put_sess_cmd() to drop cmd_kref to 1.  The final
     * target_put_sess_cmd() call will be made from TFO->check_stop_free()
     * -> tcm_qla2xxx_check_stop_free() to release the TMR associated se_cmd
     * descriptor after TFO->queue_tm_rsp() -> tcm_qla2xxx_queue_tm_rsp() ->
     * qlt_xmit_tm_rsp() returns here..
     */
    ha->tgt.tgt_ops->free_mcmd(mcmd);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
}
EXPORT_SYMBOL(qlt_xmit_tm_rsp);

/* No locks */
static int qlt_pci_map_calc_cnt(struct qla_tgt_prm *prm)
{
    struct qla_tgt_cmd *cmd = prm->cmd;

    BUG_ON(cmd->sg_cnt == 0);

    prm->sg = (struct scatterlist *)cmd->sg;
    prm->seg_cnt = pci_map_sg(prm->tgt->ha->pdev, cmd->sg,
        cmd->sg_cnt, cmd->dma_data_direction);
    if (unlikely(prm->seg_cnt == 0))
        goto out_err;

    prm->cmd->sg_mapped = 1;

    /*
     * If greater than four sg entries then we need to allocate
     * the continuation entries
     */
    if (prm->seg_cnt > prm->tgt->datasegs_per_cmd)
        prm->req_cnt += DIV_ROUND_UP(prm->seg_cnt -
            prm->tgt->datasegs_per_cmd, prm->tgt->datasegs_per_cont);

    ql_dbg(ql_dbg_tgt, prm->cmd->vha, 0xe009, "seg_cnt=%d, req_cnt=%d\n",
        prm->seg_cnt, prm->req_cnt);
    return 0;

out_err:
    ql_dbg(ql_dbg_tgt, prm->cmd->vha, 0xe04d,
        "qla_target(%d): PCI mapping failed: sg_cnt=%d",
        0, prm->cmd->sg_cnt);
    return -1;
}

static inline void qlt_unmap_sg(struct scsi_qla_host *vha,
    struct qla_tgt_cmd *cmd)
{
    struct qla_hw_data *ha = vha->hw;

    BUG_ON(!cmd->sg_mapped);
    pci_unmap_sg(ha->pdev, cmd->sg, cmd->sg_cnt, cmd->dma_data_direction);
    cmd->sg_mapped = 0;
}

static int qlt_check_reserve_free_req(struct scsi_qla_host *vha,
    uint32_t req_cnt)
{
    struct qla_hw_data *ha = vha->hw;
    device_reg_t __iomem *reg = ha->iobase;
    uint32_t cnt;

    if (vha->req->cnt < (req_cnt + 2)) {
        cnt = (uint16_t)RD_REG_DWORD(&reg->isp24.req_q_out);

        ql_dbg(ql_dbg_tgt, vha, 0xe00a,
            "Request ring circled: cnt=%d, vha->->ring_index=%d, "
            "vha->req->cnt=%d, req_cnt=%d\n", cnt,
            vha->req->ring_index, vha->req->cnt, req_cnt);
        if  (vha->req->ring_index < cnt)
            vha->req->cnt = cnt - vha->req->ring_index;
        else
            vha->req->cnt = vha->req->length -
                (vha->req->ring_index - cnt);
    }

    if (unlikely(vha->req->cnt < (req_cnt + 2))) {
        ql_dbg(ql_dbg_tgt, vha, 0xe00b,
            "qla_target(%d): There is no room in the "
            "request ring: vha->req->ring_index=%d, vha->req->cnt=%d, "
            "req_cnt=%d\n", vha->vp_idx, vha->req->ring_index,
            vha->req->cnt, req_cnt);
        return -EAGAIN;
    }
    vha->req->cnt -= req_cnt;

    return 0;
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static inline void *qlt_get_req_pkt(struct scsi_qla_host *vha)
{
    /* Adjust ring index. */
    vha->req->ring_index++;
    if (vha->req->ring_index == vha->req->length) {
        vha->req->ring_index = 0;
        vha->req->ring_ptr = vha->req->ring;
    } else {
        vha->req->ring_ptr++;
    }
    return (cont_entry_t *)vha->req->ring_ptr;
}

/* ha->hardware_lock supposed to be held on entry */
static inline uint32_t qlt_make_handle(struct scsi_qla_host *vha)
{
    struct qla_hw_data *ha = vha->hw;
    uint32_t h;

    h = ha->tgt.current_handle;
    /* always increment cmd handle */
    do {
        ++h;
        if (h > MAX_OUTSTANDING_COMMANDS)
            h = 1; /* 0 is QLA_TGT_NULL_HANDLE */
        if (h == ha->tgt.current_handle) {
            ql_dbg(ql_dbg_tgt, vha, 0xe04e,
                "qla_target(%d): Ran out of "
                "empty cmd slots in ha %p\n", vha->vp_idx, ha);
            h = QLA_TGT_NULL_HANDLE;
            break;
        }
    } while ((h == QLA_TGT_NULL_HANDLE) ||
        (h == QLA_TGT_SKIP_HANDLE) ||
        (ha->tgt.cmds[h-1] != NULL));

    if (h != QLA_TGT_NULL_HANDLE)
        ha->tgt.current_handle = h;

    return h;
}

/* ha->hardware_lock supposed to be held on entry */
static int qlt_24xx_build_ctio_pkt(struct qla_tgt_prm *prm,
    struct scsi_qla_host *vha)
{
    uint32_t h;
    struct ctio7_to_24xx *pkt;
    struct qla_hw_data *ha = vha->hw;
    struct atio_from_isp *atio = &prm->cmd->atio;

    pkt = (struct ctio7_to_24xx *)vha->req->ring_ptr;
    prm->pkt = pkt;
    memset(pkt, 0, sizeof(*pkt));

    pkt->entry_type = CTIO_TYPE7;
    pkt->entry_count = (uint8_t)prm->req_cnt;
    pkt->vp_index = vha->vp_idx;

    h = qlt_make_handle(vha);
    if (unlikely(h == QLA_TGT_NULL_HANDLE)) {
        /*
         * CTIO type 7 from the firmware doesn't provide a way to
         * know the initiator's LOOP ID, hence we can't find
         * the session and, so, the command.
         */
        return -EAGAIN;
    } else
        ha->tgt.cmds[h-1] = prm->cmd;

    pkt->handle = h | CTIO_COMPLETION_HANDLE_MARK;
    pkt->nport_handle = prm->cmd->loop_id;
    pkt->timeout = __constant_cpu_to_le16(QLA_TGT_TIMEOUT);
    pkt->initiator_id[0] = atio->u.isp24.fcp_hdr.s_id[2];
    pkt->initiator_id[1] = atio->u.isp24.fcp_hdr.s_id[1];
    pkt->initiator_id[2] = atio->u.isp24.fcp_hdr.s_id[0];
    pkt->exchange_addr = atio->u.isp24.exchange_addr;
    pkt->u.status0.flags |= (atio->u.isp24.attr << 9);
    pkt->u.status0.ox_id = swab16(atio->u.isp24.fcp_hdr.ox_id);
    pkt->u.status0.relative_offset = cpu_to_le32(prm->cmd->offset);

    ql_dbg(ql_dbg_tgt, vha, 0xe00c,
        "qla_target(%d): handle(cmd) -> %08x, timeout %d, ox_id %#x\n",
        vha->vp_idx, pkt->handle, QLA_TGT_TIMEOUT,
        le16_to_cpu(pkt->u.status0.ox_id));
    return 0;
}

/*
 * ha->hardware_lock supposed to be held on entry. We have already made sure
 * that there is sufficient amount of request entries to not drop it.
 */
static void qlt_load_cont_data_segments(struct qla_tgt_prm *prm,
    struct scsi_qla_host *vha)
{
    int cnt;
    uint32_t *dword_ptr;
    int enable_64bit_addressing = prm->tgt->tgt_enable_64bit_addr;

    /* Build continuation packets */
    while (prm->seg_cnt > 0) {
        cont_a64_entry_t *cont_pkt64 =
            (cont_a64_entry_t *)qlt_get_req_pkt(vha);

        /*
         * Make sure that from cont_pkt64 none of
         * 64-bit specific fields used for 32-bit
         * addressing. Cast to (cont_entry_t *) for
         * that.
         */

        memset(cont_pkt64, 0, sizeof(*cont_pkt64));

        cont_pkt64->entry_count = 1;
        cont_pkt64->sys_define = 0;

        if (enable_64bit_addressing) {
            cont_pkt64->entry_type = CONTINUE_A64_TYPE;
            dword_ptr =
                (uint32_t *)&cont_pkt64->dseg_0_address;
        } else {
            cont_pkt64->entry_type = CONTINUE_TYPE;
            dword_ptr =
                (uint32_t *)&((cont_entry_t *)
                cont_pkt64)->dseg_0_address;
        }

        /* Load continuation entry data segments */
        for (cnt = 0;
            cnt < prm->tgt->datasegs_per_cont && prm->seg_cnt;
            cnt++, prm->seg_cnt--) {
            *dword_ptr++ =
                cpu_to_le32(pci_dma_lo32
                (sg_dma_address(prm->sg)));
            if (enable_64bit_addressing) {
                *dword_ptr++ =
                    cpu_to_le32(pci_dma_hi32
                    (sg_dma_address
                    (prm->sg)));
            }
            *dword_ptr++ = cpu_to_le32(sg_dma_len(prm->sg));

            ql_dbg(ql_dbg_tgt, vha, 0xe00d,
                "S/G Segment Cont. phys_addr=%llx:%llx, len=%d\n",
                (long long unsigned int)
                pci_dma_hi32(sg_dma_address(prm->sg)),
                (long long unsigned int)
                pci_dma_lo32(sg_dma_address(prm->sg)),
                (int)sg_dma_len(prm->sg));

            prm->sg = sg_next(prm->sg);
        }
    }
}

/*
 * ha->hardware_lock supposed to be held on entry. We have already made sure
 * that there is sufficient amount of request entries to not drop it.
 */
static void qlt_load_data_segments(struct qla_tgt_prm *prm,
    struct scsi_qla_host *vha)
{
    int cnt;
    uint32_t *dword_ptr;
    int enable_64bit_addressing = prm->tgt->tgt_enable_64bit_addr;
    struct ctio7_to_24xx *pkt24 = (struct ctio7_to_24xx *)prm->pkt;

    ql_dbg(ql_dbg_tgt, vha, 0xe00e,
        "iocb->scsi_status=%x, iocb->flags=%x\n",
        le16_to_cpu(pkt24->u.status0.scsi_status),
        le16_to_cpu(pkt24->u.status0.flags));

    pkt24->u.status0.transfer_length = cpu_to_le32(prm->cmd->bufflen);

    /* Setup packet address segment pointer */
    dword_ptr = pkt24->u.status0.dseg_0_address;

    /* Set total data segment count */
    if (prm->seg_cnt)
        pkt24->dseg_count = cpu_to_le16(prm->seg_cnt);

    if (prm->seg_cnt == 0) {
        /* No data transfer */
        *dword_ptr++ = 0;
        *dword_ptr = 0;
        return;
    }

    /* If scatter gather */
    ql_dbg(ql_dbg_tgt, vha, 0xe00f, "%s", "Building S/G data segments...");

    /* Load command entry data segments */
    for (cnt = 0;
        (cnt < prm->tgt->datasegs_per_cmd) && prm->seg_cnt;
        cnt++, prm->seg_cnt--) {
        *dword_ptr++ =
            cpu_to_le32(pci_dma_lo32(sg_dma_address(prm->sg)));
        if (enable_64bit_addressing) {
            *dword_ptr++ =
                cpu_to_le32(pci_dma_hi32(
                sg_dma_address(prm->sg)));
        }
        *dword_ptr++ = cpu_to_le32(sg_dma_len(prm->sg));

        ql_dbg(ql_dbg_tgt, vha, 0xe010,
            "S/G Segment phys_addr=%llx:%llx, len=%d\n",
            (long long unsigned int)pci_dma_hi32(sg_dma_address(
            prm->sg)),
            (long long unsigned int)pci_dma_lo32(sg_dma_address(
            prm->sg)),
            (int)sg_dma_len(prm->sg));

        prm->sg = sg_next(prm->sg);
    }

    qlt_load_cont_data_segments(prm, vha);
}

static inline int qlt_has_data(struct qla_tgt_cmd *cmd)
{
    return cmd->bufflen > 0;
}

/*
 * Called without ha->hardware_lock held
 */
static int qlt_pre_xmit_response(struct qla_tgt_cmd *cmd,
    struct qla_tgt_prm *prm, int xmit_type, uint8_t scsi_status,
    uint32_t *full_req_cnt)
{
    struct qla_tgt *tgt = cmd->tgt;
    struct scsi_qla_host *vha = tgt->vha;
    struct qla_hw_data *ha = vha->hw;
    struct se_cmd *se_cmd = &cmd->se_cmd;

    if (unlikely(cmd->aborted)) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf014,
            "qla_target(%d): terminating exchange "
            "for aborted cmd=%p (se_cmd=%p, tag=%d)", vha->vp_idx, cmd,
            se_cmd, cmd->tag);

        cmd->state = QLA_TGT_STATE_ABORTED;

        qlt_send_term_exchange(vha, cmd, &cmd->atio, 0);

        /* !! At this point cmd could be already freed !! */
        return QLA_TGT_PRE_XMIT_RESP_CMD_ABORTED;
    }

    ql_dbg(ql_dbg_tgt, vha, 0xe011, "qla_target(%d): tag=%u\n",
        vha->vp_idx, cmd->tag);

    prm->cmd = cmd;
    prm->tgt = tgt;
    prm->rq_result = scsi_status;
    prm->sense_buffer = &cmd->sense_buffer[0];
    prm->sense_buffer_len = TRANSPORT_SENSE_BUFFER;
    prm->sg = NULL;
    prm->seg_cnt = -1;
    prm->req_cnt = 1;
    prm->add_status_pkt = 0;

    ql_dbg(ql_dbg_tgt, vha, 0xe012, "rq_result=%x, xmit_type=%x\n",
        prm->rq_result, xmit_type);

    /* Send marker if required */
    if (qlt_issue_marker(vha, 0) != QLA_SUCCESS)
        return -EFAULT;

    ql_dbg(ql_dbg_tgt, vha, 0xe013, "CTIO start: vha(%d)\n", vha->vp_idx);

    if ((xmit_type & QLA_TGT_XMIT_DATA) && qlt_has_data(cmd)) {
        if  (qlt_pci_map_calc_cnt(prm) != 0)
            return -EAGAIN;
    }

    *full_req_cnt = prm->req_cnt;

    if (se_cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
        prm->residual = se_cmd->residual_count;
        ql_dbg(ql_dbg_tgt, vha, 0xe014,
            "Residual underflow: %d (tag %d, "
            "op %x, bufflen %d, rq_result %x)\n", prm->residual,
            cmd->tag, se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
            cmd->bufflen, prm->rq_result);
        prm->rq_result |= SS_RESIDUAL_UNDER;
    } else if (se_cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
        prm->residual = se_cmd->residual_count;
        ql_dbg(ql_dbg_tgt, vha, 0xe015,
            "Residual overflow: %d (tag %d, "
            "op %x, bufflen %d, rq_result %x)\n", prm->residual,
            cmd->tag, se_cmd->t_task_cdb ? se_cmd->t_task_cdb[0] : 0,
            cmd->bufflen, prm->rq_result);
        prm->rq_result |= SS_RESIDUAL_OVER;
    }

    if (xmit_type & QLA_TGT_XMIT_STATUS) {
        /*
         * If QLA_TGT_XMIT_DATA is not set, add_status_pkt will be
         * ignored in *xmit_response() below
         */
        if (qlt_has_data(cmd)) {
            if (QLA_TGT_SENSE_VALID(prm->sense_buffer) ||
                (IS_FWI2_CAPABLE(ha) &&
                (prm->rq_result != 0))) {
                prm->add_status_pkt = 1;
                (*full_req_cnt)++;
            }
        }
    }

    ql_dbg(ql_dbg_tgt, vha, 0xe016,
        "req_cnt=%d, full_req_cnt=%d, add_status_pkt=%d\n",
        prm->req_cnt, *full_req_cnt, prm->add_status_pkt);

    return 0;
}

static inline int qlt_need_explicit_conf(struct qla_hw_data *ha,
    struct qla_tgt_cmd *cmd, int sending_sense)
{
    if (ha->tgt.enable_class_2)
        return 0;

    if (sending_sense)
        return cmd->conf_compl_supported;
    else
        return ha->tgt.enable_explicit_conf &&
            cmd->conf_compl_supported;
}

#ifdef CONFIG_QLA_TGT_DEBUG_SRR
/*
 *  Original taken from the XFS code
 */
static unsigned long qlt_srr_random(void)
{
    static int Inited;
    static unsigned long RandomValue;
    static DEFINE_SPINLOCK(lock);
    /* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */
    register long rv;
    register long lo;
    register long hi;
    unsigned long flags;

    spin_lock_irqsave(&lock, flags);
    if (!Inited) {
        RandomValue = jiffies;
        Inited = 1;
    }
    rv = RandomValue;
    hi = rv / 127773;
    lo = rv % 127773;
    rv = 16807 * lo - 2836 * hi;
    if (rv <= 0)
        rv += 2147483647;
    RandomValue = rv;
    spin_unlock_irqrestore(&lock, flags);
    return rv;
}

static void qlt_check_srr_debug(struct qla_tgt_cmd *cmd, int *xmit_type)
{
#if 0 /* This is not a real status packets lost, so it won't lead to SRR */
    if ((*xmit_type & QLA_TGT_XMIT_STATUS) && (qlt_srr_random() % 200)
        == 50) {
        *xmit_type &= ~QLA_TGT_XMIT_STATUS;
        ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf015,
            "Dropping cmd %p (tag %d) status", cmd, cmd->tag);
    }
#endif
    /*
     * It's currently not possible to simulate SRRs for FCP_WRITE without
     * a physical link layer failure, so don't even try here..
     */
    if (cmd->dma_data_direction != DMA_FROM_DEVICE)
        return;

    if (qlt_has_data(cmd) && (cmd->sg_cnt > 1) &&
        ((qlt_srr_random() % 100) == 20)) {
        int i, leave = 0;
        unsigned int tot_len = 0;

        while (leave == 0)
            leave = qlt_srr_random() % cmd->sg_cnt;

        for (i = 0; i < leave; i++)
            tot_len += cmd->sg[i].length;

        ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf016,
            "Cutting cmd %p (tag %d) buffer"
            " tail to len %d, sg_cnt %d (cmd->bufflen %d,"
            " cmd->sg_cnt %d)", cmd, cmd->tag, tot_len, leave,
            cmd->bufflen, cmd->sg_cnt);

        cmd->bufflen = tot_len;
        cmd->sg_cnt = leave;
    }

    if (qlt_has_data(cmd) && ((qlt_srr_random() % 100) == 70)) {
        unsigned int offset = qlt_srr_random() % cmd->bufflen;

        ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf017,
            "Cutting cmd %p (tag %d) buffer head "
            "to offset %d (cmd->bufflen %d)", cmd, cmd->tag, offset,
            cmd->bufflen);
        if (offset == 0)
            *xmit_type &= ~QLA_TGT_XMIT_DATA;
        else if (qlt_set_data_offset(cmd, offset)) {
            ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf018,
                "qlt_set_data_offset() failed (tag %d)", cmd->tag);
        }
    }
}
#else
static inline void qlt_check_srr_debug(struct qla_tgt_cmd *cmd, int *xmit_type)
{}
#endif

static void qlt_24xx_init_ctio_to_isp(struct ctio7_to_24xx *ctio,
    struct qla_tgt_prm *prm)
{
    prm->sense_buffer_len = min_t(uint32_t, prm->sense_buffer_len,
        (uint32_t)sizeof(ctio->u.status1.sense_data));
    ctio->u.status0.flags |=
        __constant_cpu_to_le16(CTIO7_FLAGS_SEND_STATUS);
    if (qlt_need_explicit_conf(prm->tgt->ha, prm->cmd, 0)) {
        ctio->u.status0.flags |= __constant_cpu_to_le16(
            CTIO7_FLAGS_EXPLICIT_CONFORM |
            CTIO7_FLAGS_CONFORM_REQ);
    }
    ctio->u.status0.residual = cpu_to_le32(prm->residual);
    ctio->u.status0.scsi_status = cpu_to_le16(prm->rq_result);
    if (QLA_TGT_SENSE_VALID(prm->sense_buffer)) {
        int i;

        if (qlt_need_explicit_conf(prm->tgt->ha, prm->cmd, 1)) {
            if (prm->cmd->se_cmd.scsi_status != 0) {
                ql_dbg(ql_dbg_tgt, prm->cmd->vha, 0xe017,
                    "Skipping EXPLICIT_CONFORM and "
                    "CTIO7_FLAGS_CONFORM_REQ for FCP READ w/ "
                    "non GOOD status\n");
                goto skip_explict_conf;
            }
            ctio->u.status1.flags |= __constant_cpu_to_le16(
                CTIO7_FLAGS_EXPLICIT_CONFORM |
                CTIO7_FLAGS_CONFORM_REQ);
        }
skip_explict_conf:
        ctio->u.status1.flags &=
            ~__constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_0);
        ctio->u.status1.flags |=
            __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1);
        ctio->u.status1.scsi_status |=
            __constant_cpu_to_le16(SS_SENSE_LEN_VALID);
        ctio->u.status1.sense_length =
            cpu_to_le16(prm->sense_buffer_len);
        for (i = 0; i < prm->sense_buffer_len/4; i++)
            ((uint32_t *)ctio->u.status1.sense_data)[i] =
                cpu_to_be32(((uint32_t *)prm->sense_buffer)[i]);
#if 0
        if (unlikely((prm->sense_buffer_len % 4) != 0)) {
            static int q;
            if (q < 10) {
                ql_dbg(ql_dbg_tgt, vha, 0xe04f,
                    "qla_target(%d): %d bytes of sense "
                    "lost", prm->tgt->ha->vp_idx,
                    prm->sense_buffer_len % 4);
                q++;
            }
        }
#endif
    } else {
        ctio->u.status1.flags &=
            ~__constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_0);
        ctio->u.status1.flags |=
            __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1);
        ctio->u.status1.sense_length = 0;
        memset(ctio->u.status1.sense_data, 0,
            sizeof(ctio->u.status1.sense_data));
    }

    /* Sense with len > 24, is it possible ??? */
}

/*
 * Callback to setup response of xmit_type of QLA_TGT_XMIT_DATA and *
 * QLA_TGT_XMIT_STATUS for >= 24xx silicon
 */
int qlt_xmit_response(struct qla_tgt_cmd *cmd, int xmit_type,
    uint8_t scsi_status)
{
    struct scsi_qla_host *vha = cmd->vha;
    struct qla_hw_data *ha = vha->hw;
    struct ctio7_to_24xx *pkt;
    struct qla_tgt_prm prm;
    uint32_t full_req_cnt = 0;
    unsigned long flags = 0;
    int res;

    memset(&prm, 0, sizeof(prm));
    qlt_check_srr_debug(cmd, &xmit_type);

    ql_dbg(ql_dbg_tgt, cmd->vha, 0xe018,
        "is_send_status=%d, cmd->bufflen=%d, cmd->sg_cnt=%d, "
        "cmd->dma_data_direction=%d\n", (xmit_type & QLA_TGT_XMIT_STATUS) ?
        1 : 0, cmd->bufflen, cmd->sg_cnt, cmd->dma_data_direction);

    res = qlt_pre_xmit_response(cmd, &prm, xmit_type, scsi_status,
        &full_req_cnt);
    if (unlikely(res != 0)) {
        if (res == QLA_TGT_PRE_XMIT_RESP_CMD_ABORTED)
            return 0;

        return res;
    }

    spin_lock_irqsave(&ha->hardware_lock, flags);

    /* Does F/W have an IOCBs for this request */
    res = qlt_check_reserve_free_req(vha, full_req_cnt);
    if (unlikely(res))
        goto out_unmap_unlock;

    res = qlt_24xx_build_ctio_pkt(&prm, vha);
    if (unlikely(res != 0))
        goto out_unmap_unlock;


    pkt = (struct ctio7_to_24xx *)prm.pkt;

    if (qlt_has_data(cmd) && (xmit_type & QLA_TGT_XMIT_DATA)) {
        pkt->u.status0.flags |=
            __constant_cpu_to_le16(CTIO7_FLAGS_DATA_IN |
            CTIO7_FLAGS_STATUS_MODE_0);

        qlt_load_data_segments(&prm, vha);

        if (prm.add_status_pkt == 0) {
            if (xmit_type & QLA_TGT_XMIT_STATUS) {
                pkt->u.status0.scsi_status =
                    cpu_to_le16(prm.rq_result);
                pkt->u.status0.residual =
                    cpu_to_le32(prm.residual);
                pkt->u.status0.flags |= __constant_cpu_to_le16(
                    CTIO7_FLAGS_SEND_STATUS);
                if (qlt_need_explicit_conf(ha, cmd, 0)) {
                    pkt->u.status0.flags |=
                        __constant_cpu_to_le16(
                        CTIO7_FLAGS_EXPLICIT_CONFORM |
                        CTIO7_FLAGS_CONFORM_REQ);
                }
            }

        } else {
            /*
             * We have already made sure that there is sufficient
             * amount of request entries to not drop HW lock in
             * req_pkt().
             */
            struct ctio7_to_24xx *ctio =
                (struct ctio7_to_24xx *)qlt_get_req_pkt(vha);

            ql_dbg(ql_dbg_tgt, vha, 0xe019,
                "Building additional status packet\n");

            memcpy(ctio, pkt, sizeof(*ctio));
            ctio->entry_count = 1;
            ctio->dseg_count = 0;
            ctio->u.status1.flags &= ~__constant_cpu_to_le16(
                CTIO7_FLAGS_DATA_IN);

            /* Real finish is ctio_m1's finish */
            pkt->handle |= CTIO_INTERMEDIATE_HANDLE_MARK;
            pkt->u.status0.flags |= __constant_cpu_to_le16(
                CTIO7_FLAGS_DONT_RET_CTIO);
            qlt_24xx_init_ctio_to_isp((struct ctio7_to_24xx *)ctio,
                &prm);
            pr_debug("Status CTIO7: %p\n", ctio);
        }
    } else
        qlt_24xx_init_ctio_to_isp(pkt, &prm);


    cmd->state = QLA_TGT_STATE_PROCESSED; /* Mid-level is done processing */

    ql_dbg(ql_dbg_tgt, vha, 0xe01a,
        "Xmitting CTIO7 response pkt for 24xx: %p scsi_status: 0x%02x\n",
        pkt, scsi_status);

    qla2x00_start_iocbs(vha, vha->req);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    return 0;

out_unmap_unlock:
    if (cmd->sg_mapped)
        qlt_unmap_sg(vha, cmd);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    return res;
}
EXPORT_SYMBOL(qlt_xmit_response);

int qlt_rdy_to_xfer(struct qla_tgt_cmd *cmd)
{
    struct ctio7_to_24xx *pkt;
    struct scsi_qla_host *vha = cmd->vha;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = cmd->tgt;
    struct qla_tgt_prm prm;
    unsigned long flags;
    int res = 0;

    memset(&prm, 0, sizeof(prm));
    prm.cmd = cmd;
    prm.tgt = tgt;
    prm.sg = NULL;
    prm.req_cnt = 1;

    /* Send marker if required */
    if (qlt_issue_marker(vha, 0) != QLA_SUCCESS)
        return -EIO;

    ql_dbg(ql_dbg_tgt, vha, 0xe01b, "CTIO_start: vha(%d)",
        (int)vha->vp_idx);

    /* Calculate number of entries and segments required */
    if (qlt_pci_map_calc_cnt(&prm) != 0)
        return -EAGAIN;

    spin_lock_irqsave(&ha->hardware_lock, flags);

    /* Does F/W have an IOCBs for this request */
    res = qlt_check_reserve_free_req(vha, prm.req_cnt);
    if (res != 0)
        goto out_unlock_free_unmap;

    res = qlt_24xx_build_ctio_pkt(&prm, vha);
    if (unlikely(res != 0))
        goto out_unlock_free_unmap;
    pkt = (struct ctio7_to_24xx *)prm.pkt;
    pkt->u.status0.flags |= __constant_cpu_to_le16(CTIO7_FLAGS_DATA_OUT |
        CTIO7_FLAGS_STATUS_MODE_0);
    qlt_load_data_segments(&prm, vha);

    cmd->state = QLA_TGT_STATE_NEED_DATA;

    qla2x00_start_iocbs(vha, vha->req);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    return res;

out_unlock_free_unmap:
    if (cmd->sg_mapped)
        qlt_unmap_sg(vha, cmd);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    return res;
}
EXPORT_SYMBOL(qlt_rdy_to_xfer);

/* If hardware_lock held on entry, might drop it, then reaquire */
/* This function sends the appropriate CTIO to ISP 2xxx or 24xx */
static int __qlt_send_term_exchange(struct scsi_qla_host *vha,
    struct qla_tgt_cmd *cmd,
    struct atio_from_isp *atio)
{
    struct ctio7_to_24xx *ctio24;
    struct qla_hw_data *ha = vha->hw;
    request_t *pkt;
    int ret = 0;

    ql_dbg(ql_dbg_tgt, vha, 0xe01c, "Sending TERM EXCH CTIO (ha=%p)\n", ha);

    pkt = (request_t *)qla2x00_alloc_iocbs(vha, NULL);
    if (pkt == NULL) {
        ql_dbg(ql_dbg_tgt, vha, 0xe050,
            "qla_target(%d): %s failed: unable to allocate "
            "request packet\n", vha->vp_idx, __func__);
        return -ENOMEM;
    }

    if (cmd != NULL) {
        if (cmd->state < QLA_TGT_STATE_PROCESSED) {
            ql_dbg(ql_dbg_tgt, vha, 0xe051,
                "qla_target(%d): Terminating cmd %p with "
                "incorrect state %d\n", vha->vp_idx, cmd,
                cmd->state);
        } else
            ret = 1;
    }

    pkt->entry_count = 1;
    pkt->handle = QLA_TGT_SKIP_HANDLE | CTIO_COMPLETION_HANDLE_MARK;

    ctio24 = (struct ctio7_to_24xx *)pkt;
    ctio24->entry_type = CTIO_TYPE7;
    ctio24->nport_handle = cmd ? cmd->loop_id : CTIO7_NHANDLE_UNRECOGNIZED;
    ctio24->timeout = __constant_cpu_to_le16(QLA_TGT_TIMEOUT);
    ctio24->vp_index = vha->vp_idx;
    ctio24->initiator_id[0] = atio->u.isp24.fcp_hdr.s_id[2];
    ctio24->initiator_id[1] = atio->u.isp24.fcp_hdr.s_id[1];
    ctio24->initiator_id[2] = atio->u.isp24.fcp_hdr.s_id[0];
    ctio24->exchange_addr = atio->u.isp24.exchange_addr;
    ctio24->u.status1.flags = (atio->u.isp24.attr << 9) |
        __constant_cpu_to_le16(CTIO7_FLAGS_STATUS_MODE_1 |
        CTIO7_FLAGS_TERMINATE);
    ctio24->u.status1.ox_id = swab16(atio->u.isp24.fcp_hdr.ox_id);

    /* Most likely, it isn't needed */
    ctio24->u.status1.residual = get_unaligned((uint32_t *)
        &atio->u.isp24.fcp_cmnd.add_cdb[
        atio->u.isp24.fcp_cmnd.add_cdb_len]);
    if (ctio24->u.status1.residual != 0)
        ctio24->u.status1.scsi_status |= SS_RESIDUAL_UNDER;

    qla2x00_start_iocbs(vha, vha->req);
    return ret;
}

static void qlt_send_term_exchange(struct scsi_qla_host *vha,
    struct qla_tgt_cmd *cmd, struct atio_from_isp *atio, int ha_locked)
{
    unsigned long flags;
    int rc;

    if (qlt_issue_marker(vha, ha_locked) < 0)
        return;

    if (ha_locked) {
        rc = __qlt_send_term_exchange(vha, cmd, atio);
        goto done;
    }
    spin_lock_irqsave(&vha->hw->hardware_lock, flags);
    rc = __qlt_send_term_exchange(vha, cmd, atio);
    spin_unlock_irqrestore(&vha->hw->hardware_lock, flags);
done:
    if (rc == 1) {
        if (!ha_locked && !in_interrupt())
            msleep(250); /* just in case */

        vha->hw->tgt.tgt_ops->free_cmd(cmd);
    }
}

void qlt_free_cmd(struct qla_tgt_cmd *cmd)
{
    BUG_ON(cmd->sg_mapped);

    if (unlikely(cmd->free_sg))
        kfree(cmd->sg);
    kmem_cache_free(qla_tgt_cmd_cachep, cmd);
}
EXPORT_SYMBOL(qlt_free_cmd);

/* ha->hardware_lock supposed to be held on entry */
static int qlt_prepare_srr_ctio(struct scsi_qla_host *vha,
    struct qla_tgt_cmd *cmd, void *ctio)
{
    struct qla_tgt_srr_ctio *sc;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    struct qla_tgt_srr_imm *imm;

    tgt->ctio_srr_id++;

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf019,
        "qla_target(%d): CTIO with SRR status received\n", vha->vp_idx);

    if (!ctio) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf055,
            "qla_target(%d): SRR CTIO, but ctio is NULL\n",
            vha->vp_idx);
        return -EINVAL;
    }

    sc = kzalloc(sizeof(*sc), GFP_ATOMIC);
    if (sc != NULL) {
        sc->cmd = cmd;
        /* IRQ is already OFF */
        spin_lock(&tgt->srr_lock);
        sc->srr_id = tgt->ctio_srr_id;
        list_add_tail(&sc->srr_list_entry,
            &tgt->srr_ctio_list);
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01a,
            "CTIO SRR %p added (id %d)\n", sc, sc->srr_id);
        if (tgt->imm_srr_id == tgt->ctio_srr_id) {
            int found = 0;
            list_for_each_entry(imm, &tgt->srr_imm_list,
                srr_list_entry) {
                if (imm->srr_id == sc->srr_id) {
                    found = 1;
                    break;
                }
            }
            if (found) {
                ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01b,
                    "Scheduling srr work\n");
                schedule_work(&tgt->srr_work);
            } else {
                ql_dbg(ql_dbg_tgt_mgt, vha, 0xf056,
                    "qla_target(%d): imm_srr_id "
                    "== ctio_srr_id (%d), but there is no "
                    "corresponding SRR IMM, deleting CTIO "
                    "SRR %p\n", vha->vp_idx,
                    tgt->ctio_srr_id, sc);
                list_del(&sc->srr_list_entry);
                spin_unlock(&tgt->srr_lock);

                kfree(sc);
                return -EINVAL;
            }
        }
        spin_unlock(&tgt->srr_lock);
    } else {
        struct qla_tgt_srr_imm *ti;

        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf057,
            "qla_target(%d): Unable to allocate SRR CTIO entry\n",
            vha->vp_idx);
        spin_lock(&tgt->srr_lock);
        list_for_each_entry_safe(imm, ti, &tgt->srr_imm_list,
            srr_list_entry) {
            if (imm->srr_id == tgt->ctio_srr_id) {
                ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01c,
                    "IMM SRR %p deleted (id %d)\n",
                    imm, imm->srr_id);
                list_del(&imm->srr_list_entry);
                qlt_reject_free_srr_imm(vha, imm, 1);
            }
        }
        spin_unlock(&tgt->srr_lock);

        return -ENOMEM;
    }

    return 0;
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static int qlt_term_ctio_exchange(struct scsi_qla_host *vha, void *ctio,
    struct qla_tgt_cmd *cmd, uint32_t status)
{
    int term = 0;

    if (ctio != NULL) {
        struct ctio7_from_24xx *c = (struct ctio7_from_24xx *)ctio;
        term = !(c->flags &
            __constant_cpu_to_le16(OF_TERM_EXCH));
    } else
        term = 1;

    if (term)
        qlt_send_term_exchange(vha, cmd, &cmd->atio, 1);

    return term;
}

/* ha->hardware_lock supposed to be held on entry */
static inline struct qla_tgt_cmd *qlt_get_cmd(struct scsi_qla_host *vha,
    uint32_t handle)
{
    struct qla_hw_data *ha = vha->hw;

    handle--;
    if (ha->tgt.cmds[handle] != NULL) {
        struct qla_tgt_cmd *cmd = ha->tgt.cmds[handle];
        ha->tgt.cmds[handle] = NULL;
        return cmd;
    } else
        return NULL;
}

/* ha->hardware_lock supposed to be held on entry */
static struct qla_tgt_cmd *qlt_ctio_to_cmd(struct scsi_qla_host *vha,
    uint32_t handle, void *ctio)
{
    struct qla_tgt_cmd *cmd = NULL;

    /* Clear out internal marks */
    handle &= ~(CTIO_COMPLETION_HANDLE_MARK |
        CTIO_INTERMEDIATE_HANDLE_MARK);

    if (handle != QLA_TGT_NULL_HANDLE) {
        if (unlikely(handle == QLA_TGT_SKIP_HANDLE)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe01d, "%s",
                "SKIP_HANDLE CTIO\n");
            return NULL;
        }
        /* handle-1 is actually used */
        if (unlikely(handle > MAX_OUTSTANDING_COMMANDS)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe052,
                "qla_target(%d): Wrong handle %x received\n",
                vha->vp_idx, handle);
            return NULL;
        }
        cmd = qlt_get_cmd(vha, handle);
        if (unlikely(cmd == NULL)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe053,
                "qla_target(%d): Suspicious: unable to "
                "find the command with handle %x\n", vha->vp_idx,
                handle);
            return NULL;
        }
    } else if (ctio != NULL) {
        /* We can't get loop ID from CTIO7 */
        ql_dbg(ql_dbg_tgt, vha, 0xe054,
            "qla_target(%d): Wrong CTIO received: QLA24xx doesn't "
            "support NULL handles\n", vha->vp_idx);
        return NULL;
    }

    return cmd;
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_do_ctio_completion(struct scsi_qla_host *vha, uint32_t handle,
    uint32_t status, void *ctio)
{
    struct qla_hw_data *ha = vha->hw;
    struct se_cmd *se_cmd;
    struct target_core_fabric_ops *tfo;
    struct qla_tgt_cmd *cmd;

    ql_dbg(ql_dbg_tgt, vha, 0xe01e,
        "qla_target(%d): handle(ctio %p status %#x) <- %08x\n",
        vha->vp_idx, ctio, status, handle);

    if (handle & CTIO_INTERMEDIATE_HANDLE_MARK) {
        /* That could happen only in case of an error/reset/abort */
        if (status != CTIO_SUCCESS) {
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01d,
                "Intermediate CTIO received"
                " (status %x)\n", status);
        }
        return;
    }

    cmd = qlt_ctio_to_cmd(vha, handle, ctio);
    if (cmd == NULL)
        return;

    se_cmd = &cmd->se_cmd;
    tfo = se_cmd->se_tfo;

    if (cmd->sg_mapped)
        qlt_unmap_sg(vha, cmd);

    if (unlikely(status != CTIO_SUCCESS)) {
        switch (status & 0xFFFF) {
        case CTIO_LIP_RESET:
        case CTIO_TARGET_RESET:
        case CTIO_ABORTED:
        case CTIO_TIMEOUT:
        case CTIO_INVALID_RX_ID:
            /* They are OK */
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf058,
                "qla_target(%d): CTIO with "
                "status %#x received, state %x, se_cmd %p, "
                "(LIP_RESET=e, ABORTED=2, TARGET_RESET=17, "
                "TIMEOUT=b, INVALID_RX_ID=8)\n", vha->vp_idx,
                status, cmd->state, se_cmd);
            break;

        case CTIO_PORT_LOGGED_OUT:
        case CTIO_PORT_UNAVAILABLE:
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf059,
                "qla_target(%d): CTIO with PORT LOGGED "
                "OUT (29) or PORT UNAVAILABLE (28) status %x "
                "received (state %x, se_cmd %p)\n", vha->vp_idx,
                status, cmd->state, se_cmd);
            break;

        case CTIO_SRR_RECEIVED:
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05a,
                "qla_target(%d): CTIO with SRR_RECEIVED"
                " status %x received (state %x, se_cmd %p)\n",
                vha->vp_idx, status, cmd->state, se_cmd);
            if (qlt_prepare_srr_ctio(vha, cmd, ctio) != 0)
                break;
            else
                return;

        default:
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05b,
                "qla_target(%d): CTIO with error status "
                "0x%x received (state %x, se_cmd %p\n",
                vha->vp_idx, status, cmd->state, se_cmd);
            break;
        }

        if (cmd->state != QLA_TGT_STATE_NEED_DATA)
            if (qlt_term_ctio_exchange(vha, ctio, cmd, status))
                return;
    }

    if (cmd->state == QLA_TGT_STATE_PROCESSED) {
        ql_dbg(ql_dbg_tgt, vha, 0xe01f, "Command %p finished\n", cmd);
    } else if (cmd->state == QLA_TGT_STATE_NEED_DATA) {
        int rx_status = 0;

        cmd->state = QLA_TGT_STATE_DATA_IN;

        if (unlikely(status != CTIO_SUCCESS))
            rx_status = -EIO;
        else
            cmd->write_data_transferred = 1;

        ql_dbg(ql_dbg_tgt, vha, 0xe020,
            "Data received, context %x, rx_status %d\n",
            0x0, rx_status);

        ha->tgt.tgt_ops->handle_data(cmd);
        return;
    } else if (cmd->state == QLA_TGT_STATE_ABORTED) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01e,
            "Aborted command %p (tag %d) finished\n", cmd, cmd->tag);
    } else {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05c,
            "qla_target(%d): A command in state (%d) should "
            "not return a CTIO complete\n", vha->vp_idx, cmd->state);
    }

    if (unlikely(status != CTIO_SUCCESS)) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf01f, "Finishing failed CTIO\n");
        dump_stack();
    }

    ha->tgt.tgt_ops->free_cmd(cmd);
}

/* ha->hardware_lock supposed to be held on entry */
/* called via callback from qla2xxx */
void qlt_ctio_completion(struct scsi_qla_host *vha, uint32_t handle)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;

    if (likely(tgt == NULL)) {
        ql_dbg(ql_dbg_tgt, vha, 0xe021,
            "CTIO, but target mode not enabled"
            " (ha %d %p handle %#x)", vha->vp_idx, ha, handle);
        return;
    }

    tgt->irq_cmd_count++;
    qlt_do_ctio_completion(vha, handle, CTIO_SUCCESS, NULL);
    tgt->irq_cmd_count--;
}

static inline int qlt_get_fcp_task_attr(struct scsi_qla_host *vha,
    uint8_t task_codes)
{
    int fcp_task_attr;

    switch (task_codes) {
    case ATIO_SIMPLE_QUEUE:
        fcp_task_attr = MSG_SIMPLE_TAG;
        break;
    case ATIO_HEAD_OF_QUEUE:
        fcp_task_attr = MSG_HEAD_TAG;
        break;
    case ATIO_ORDERED_QUEUE:
        fcp_task_attr = MSG_ORDERED_TAG;
        break;
    case ATIO_ACA_QUEUE:
        fcp_task_attr = MSG_ACA_TAG;
        break;
    case ATIO_UNTAGGED:
        fcp_task_attr = MSG_SIMPLE_TAG;
        break;
    default:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05d,
            "qla_target: unknown task code %x, use ORDERED instead\n",
            task_codes);
        fcp_task_attr = MSG_ORDERED_TAG;
        break;
    }

    return fcp_task_attr;
}

static struct qla_tgt_sess *qlt_make_local_sess(struct scsi_qla_host *,
                    uint8_t *);
/*
 * Process context for I/O path into tcm_qla2xxx code
 */
static void qlt_do_work(struct work_struct *work)
{
    struct qla_tgt_cmd *cmd = container_of(work, struct qla_tgt_cmd, work);
    scsi_qla_host_t *vha = cmd->vha;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    struct qla_tgt_sess *sess = NULL;
    struct atio_from_isp *atio = &cmd->atio;
    unsigned char *cdb;
    unsigned long flags;
    uint32_t data_length;
    int ret, fcp_task_attr, data_dir, bidi = 0;

    if (tgt->tgt_stop)
        goto out_term;

    spin_lock_irqsave(&ha->hardware_lock, flags);
    sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha,
        atio->u.isp24.fcp_hdr.s_id);
    /* Do kref_get() before dropping qla_hw_data->hardware_lock. */
    if (sess)
        kref_get(&sess->se_sess->sess_kref);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    if (unlikely(!sess)) {
        uint8_t *s_id = atio->u.isp24.fcp_hdr.s_id;

        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf022,
            "qla_target(%d): Unable to find wwn login"
            " (s_id %x:%x:%x), trying to create it manually\n",
            vha->vp_idx, s_id[0], s_id[1], s_id[2]);

        if (atio->u.raw.entry_count > 1) {
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf023,
                "Dropping multy entry cmd %p\n", cmd);
            goto out_term;
        }

        mutex_lock(&ha->tgt.tgt_mutex);
        sess = qlt_make_local_sess(vha, s_id);
        /* sess has an extra creation ref. */
        mutex_unlock(&ha->tgt.tgt_mutex);

        if (!sess)
            goto out_term;
    }

    cmd->sess = sess;
    cmd->loop_id = sess->loop_id;
    cmd->conf_compl_supported = sess->conf_compl_supported;

    cdb = &atio->u.isp24.fcp_cmnd.cdb[0];
    cmd->tag = atio->u.isp24.exchange_addr;
    cmd->unpacked_lun = scsilun_to_int(
        (struct scsi_lun *)&atio->u.isp24.fcp_cmnd.lun);

    if (atio->u.isp24.fcp_cmnd.rddata &&
        atio->u.isp24.fcp_cmnd.wrdata) {
        bidi = 1;
        data_dir = DMA_TO_DEVICE;
    } else if (atio->u.isp24.fcp_cmnd.rddata)
        data_dir = DMA_FROM_DEVICE;
    else if (atio->u.isp24.fcp_cmnd.wrdata)
        data_dir = DMA_TO_DEVICE;
    else
        data_dir = DMA_NONE;

    fcp_task_attr = qlt_get_fcp_task_attr(vha,
        atio->u.isp24.fcp_cmnd.task_attr);
    data_length = be32_to_cpu(get_unaligned((uint32_t *)
        &atio->u.isp24.fcp_cmnd.add_cdb[
        atio->u.isp24.fcp_cmnd.add_cdb_len]));

    ql_dbg(ql_dbg_tgt, vha, 0xe022,
        "qla_target: START qla command: %p lun: 0x%04x (tag %d)\n",
        cmd, cmd->unpacked_lun, cmd->tag);

    ret = vha->hw->tgt.tgt_ops->handle_cmd(vha, cmd, cdb, data_length,
        fcp_task_attr, data_dir, bidi);
    if (ret != 0)
        goto out_term;
    /*
     * Drop extra session reference from qla_tgt_handle_cmd_for_atio*(
     */
    ha->tgt.tgt_ops->put_sess(sess);
    return;

out_term:
    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf020, "Terminating work cmd %p", cmd);
    /*
     * cmd has not sent to target yet, so pass NULL as the second
     * argument to qlt_send_term_exchange() and free the memory here.
     */
    spin_lock_irqsave(&ha->hardware_lock, flags);
    qlt_send_term_exchange(vha, NULL, &cmd->atio, 1);
    kmem_cache_free(qla_tgt_cmd_cachep, cmd);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
    if (sess)
        ha->tgt.tgt_ops->put_sess(sess);
}

/* ha->hardware_lock supposed to be held on entry */
static int qlt_handle_cmd_for_atio(struct scsi_qla_host *vha,
    struct atio_from_isp *atio)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    struct qla_tgt_cmd *cmd;

    if (unlikely(tgt->tgt_stop)) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf021,
            "New command while device %p is shutting down\n", tgt);
        return -EFAULT;
    }

    cmd = kmem_cache_zalloc(qla_tgt_cmd_cachep, GFP_ATOMIC);
    if (!cmd) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05e,
            "qla_target(%d): Allocation of cmd failed\n", vha->vp_idx);
        return -ENOMEM;
    }

    INIT_LIST_HEAD(&cmd->cmd_list);

    memcpy(&cmd->atio, atio, sizeof(*atio));
    cmd->state = QLA_TGT_STATE_NEW;
    cmd->tgt = ha->tgt.qla_tgt;
    cmd->vha = vha;

    INIT_WORK(&cmd->work, qlt_do_work);
    queue_work(qla_tgt_wq, &cmd->work);
    return 0;

}

/* ha->hardware_lock supposed to be held on entry */
static int qlt_issue_task_mgmt(struct qla_tgt_sess *sess, uint32_t lun,
    int fn, void *iocb, int flags)
{
    struct scsi_qla_host *vha = sess->vha;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_mgmt_cmd *mcmd;
    int res;
    uint8_t tmr_func;

    mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
    if (!mcmd) {
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10009,
            "qla_target(%d): Allocation of management "
            "command failed, some commands and their data could "
            "leak\n", vha->vp_idx);
        return -ENOMEM;
    }
    memset(mcmd, 0, sizeof(*mcmd));
    mcmd->sess = sess;

    if (iocb) {
        memcpy(&mcmd->orig_iocb.imm_ntfy, iocb,
            sizeof(mcmd->orig_iocb.imm_ntfy));
    }
    mcmd->tmr_func = fn;
    mcmd->flags = flags;

    switch (fn) {
    case QLA_TGT_CLEAR_ACA:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10000,
            "qla_target(%d): CLEAR_ACA received\n", sess->vha->vp_idx);
        tmr_func = TMR_CLEAR_ACA;
        break;

    case QLA_TGT_TARGET_RESET:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10001,
            "qla_target(%d): TARGET_RESET received\n",
            sess->vha->vp_idx);
        tmr_func = TMR_TARGET_WARM_RESET;
        break;

    case QLA_TGT_LUN_RESET:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10002,
            "qla_target(%d): LUN_RESET received\n", sess->vha->vp_idx);
        tmr_func = TMR_LUN_RESET;
        break;

    case QLA_TGT_CLEAR_TS:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10003,
            "qla_target(%d): CLEAR_TS received\n", sess->vha->vp_idx);
        tmr_func = TMR_CLEAR_TASK_SET;
        break;

    case QLA_TGT_ABORT_TS:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10004,
            "qla_target(%d): ABORT_TS received\n", sess->vha->vp_idx);
        tmr_func = TMR_ABORT_TASK_SET;
        break;
#if 0
    case QLA_TGT_ABORT_ALL:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10005,
            "qla_target(%d): Doing ABORT_ALL_TASKS\n",
            sess->vha->vp_idx);
        tmr_func = 0;
        break;

    case QLA_TGT_ABORT_ALL_SESS:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10006,
            "qla_target(%d): Doing ABORT_ALL_TASKS_SESS\n",
            sess->vha->vp_idx);
        tmr_func = 0;
        break;

    case QLA_TGT_NEXUS_LOSS_SESS:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10007,
            "qla_target(%d): Doing NEXUS_LOSS_SESS\n",
            sess->vha->vp_idx);
        tmr_func = 0;
        break;

    case QLA_TGT_NEXUS_LOSS:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x10008,
            "qla_target(%d): Doing NEXUS_LOSS\n", sess->vha->vp_idx);
        tmr_func = 0;
        break;
#endif
    default:
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x1000a,
            "qla_target(%d): Unknown task mgmt fn 0x%x\n",
            sess->vha->vp_idx, fn);
        mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
        return -ENOSYS;
    }

    res = ha->tgt.tgt_ops->handle_tmr(mcmd, lun, tmr_func, 0);
    if (res != 0) {
        ql_dbg(ql_dbg_tgt_tmr, vha, 0x1000b,
            "qla_target(%d): tgt.tgt_ops->handle_tmr() failed: %d\n",
            sess->vha->vp_idx, res);
        mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
        return -EFAULT;
    }

    return 0;
}

/* ha->hardware_lock supposed to be held on entry */
static int qlt_handle_task_mgmt(struct scsi_qla_host *vha, void *iocb)
{
    struct atio_from_isp *a = (struct atio_from_isp *)iocb;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt;
    struct qla_tgt_sess *sess;
    uint32_t lun, unpacked_lun;
    int lun_size, fn;

    tgt = ha->tgt.qla_tgt;

    lun = a->u.isp24.fcp_cmnd.lun;
    lun_size = sizeof(a->u.isp24.fcp_cmnd.lun);
    fn = a->u.isp24.fcp_cmnd.task_mgmt_flags;
    sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha,
        a->u.isp24.fcp_hdr.s_id);
    unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);

    if (!sess) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf024,
            "qla_target(%d): task mgmt fn 0x%x for "
            "non-existant session\n", vha->vp_idx, fn);
        return qlt_sched_sess_work(tgt, QLA_TGT_SESS_WORK_TM, iocb,
            sizeof(struct atio_from_isp));
    }

    return qlt_issue_task_mgmt(sess, unpacked_lun, fn, iocb, 0);
}

/* ha->hardware_lock supposed to be held on entry */
static int __qlt_abort_task(struct scsi_qla_host *vha,
    struct imm_ntfy_from_isp *iocb, struct qla_tgt_sess *sess)
{
    struct atio_from_isp *a = (struct atio_from_isp *)iocb;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_mgmt_cmd *mcmd;
    uint32_t lun, unpacked_lun;
    int rc;

    mcmd = mempool_alloc(qla_tgt_mgmt_cmd_mempool, GFP_ATOMIC);
    if (mcmd == NULL) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf05f,
            "qla_target(%d): %s: Allocation of ABORT cmd failed\n",
            vha->vp_idx, __func__);
        return -ENOMEM;
    }
    memset(mcmd, 0, sizeof(*mcmd));

    mcmd->sess = sess;
    memcpy(&mcmd->orig_iocb.imm_ntfy, iocb,
        sizeof(mcmd->orig_iocb.imm_ntfy));

    lun = a->u.isp24.fcp_cmnd.lun;
    unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);

    rc = ha->tgt.tgt_ops->handle_tmr(mcmd, unpacked_lun, TMR_ABORT_TASK,
        le16_to_cpu(iocb->u.isp2x.seq_id));
    if (rc != 0) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf060,
            "qla_target(%d): tgt_ops->handle_tmr() failed: %d\n",
            vha->vp_idx, rc);
        mempool_free(mcmd, qla_tgt_mgmt_cmd_mempool);
        return -EFAULT;
    }

    return 0;
}

/* ha->hardware_lock supposed to be held on entry */
static int qlt_abort_task(struct scsi_qla_host *vha,
    struct imm_ntfy_from_isp *iocb)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_sess *sess;
    int loop_id;

    loop_id = GET_TARGET_ID(ha, (struct atio_from_isp *)iocb);

    sess = ha->tgt.tgt_ops->find_sess_by_loop_id(vha, loop_id);
    if (sess == NULL) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf025,
            "qla_target(%d): task abort for unexisting "
            "session\n", vha->vp_idx);
        return qlt_sched_sess_work(ha->tgt.qla_tgt,
            QLA_TGT_SESS_WORK_ABORT, iocb, sizeof(*iocb));
    }

    return __qlt_abort_task(vha, iocb, sess);
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static int qlt_24xx_handle_els(struct scsi_qla_host *vha,
    struct imm_ntfy_from_isp *iocb)
{
    struct qla_hw_data *ha = vha->hw;
    int res = 0;

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf026,
        "qla_target(%d): Port ID: 0x%02x:%02x:%02x"
        " ELS opcode: 0x%02x\n", vha->vp_idx, iocb->u.isp24.port_id[0],
        iocb->u.isp24.port_id[1], iocb->u.isp24.port_id[2],
        iocb->u.isp24.status_subcode);

    switch (iocb->u.isp24.status_subcode) {
    case ELS_PLOGI:
    case ELS_FLOGI:
    case ELS_PRLI:
    case ELS_LOGO:
    case ELS_PRLO:
        res = qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS_SESS);
        break;
    case ELS_PDISC:
    case ELS_ADISC:
    {
        struct qla_tgt *tgt = ha->tgt.qla_tgt;
        if (tgt->link_reinit_iocb_pending) {
            qlt_send_notify_ack(vha, &tgt->link_reinit_iocb,
                0, 0, 0, 0, 0, 0);
            tgt->link_reinit_iocb_pending = 0;
        }
        res = 1; /* send notify ack */
        break;
    }

    default:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf061,
            "qla_target(%d): Unsupported ELS command %x "
            "received\n", vha->vp_idx, iocb->u.isp24.status_subcode);
        res = qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS_SESS);
        break;
    }

    return res;
}

static int qlt_set_data_offset(struct qla_tgt_cmd *cmd, uint32_t offset)
{
    struct scatterlist *sg, *sgp, *sg_srr, *sg_srr_start = NULL;
    size_t first_offset = 0, rem_offset = offset, tmp = 0;
    int i, sg_srr_cnt, bufflen = 0;

    ql_dbg(ql_dbg_tgt, cmd->vha, 0xe023,
        "Entering qla_tgt_set_data_offset: cmd: %p, cmd->sg: %p, "
        "cmd->sg_cnt: %u, direction: %d\n",
        cmd, cmd->sg, cmd->sg_cnt, cmd->dma_data_direction);

    /*
     * FIXME: Reject non zero SRR relative offset until we can test
     * this code properly.
     */
    pr_debug("Rejecting non zero SRR rel_offs: %u\n", offset);
    return -1;

    if (!cmd->sg || !cmd->sg_cnt) {
        ql_dbg(ql_dbg_tgt, cmd->vha, 0xe055,
            "Missing cmd->sg or zero cmd->sg_cnt in"
            " qla_tgt_set_data_offset\n");
        return -EINVAL;
    }
    /*
     * Walk the current cmd->sg list until we locate the new sg_srr_start
     */
    for_each_sg(cmd->sg, sg, cmd->sg_cnt, i) {
        ql_dbg(ql_dbg_tgt, cmd->vha, 0xe024,
            "sg[%d]: %p page: %p, length: %d, offset: %d\n",
            i, sg, sg_page(sg), sg->length, sg->offset);

        if ((sg->length + tmp) > offset) {
            first_offset = rem_offset;
            sg_srr_start = sg;
            ql_dbg(ql_dbg_tgt, cmd->vha, 0xe025,
                "Found matching sg[%d], using %p as sg_srr_start, "
                "and using first_offset: %zu\n", i, sg,
                first_offset);
            break;
        }
        tmp += sg->length;
        rem_offset -= sg->length;
    }

    if (!sg_srr_start) {
        ql_dbg(ql_dbg_tgt, cmd->vha, 0xe056,
            "Unable to locate sg_srr_start for offset: %u\n", offset);
        return -EINVAL;
    }
    sg_srr_cnt = (cmd->sg_cnt - i);

    sg_srr = kzalloc(sizeof(struct scatterlist) * sg_srr_cnt, GFP_KERNEL);
    if (!sg_srr) {
        ql_dbg(ql_dbg_tgt, cmd->vha, 0xe057,
            "Unable to allocate sgp\n");
        return -ENOMEM;
    }
    sg_init_table(sg_srr, sg_srr_cnt);
    sgp = &sg_srr[0];
    /*
     * Walk the remaining list for sg_srr_start, mapping to the newly
     * allocated sg_srr taking first_offset into account.
     */
    for_each_sg(sg_srr_start, sg, sg_srr_cnt, i) {
        if (first_offset) {
            sg_set_page(sgp, sg_page(sg),
                (sg->length - first_offset), first_offset);
            first_offset = 0;
        } else {
            sg_set_page(sgp, sg_page(sg), sg->length, 0);
        }
        bufflen += sgp->length;

        sgp = sg_next(sgp);
        if (!sgp)
            break;
    }

    cmd->sg = sg_srr;
    cmd->sg_cnt = sg_srr_cnt;
    cmd->bufflen = bufflen;
    cmd->offset += offset;
    cmd->free_sg = 1;

    ql_dbg(ql_dbg_tgt, cmd->vha, 0xe026, "New cmd->sg: %p\n", cmd->sg);
    ql_dbg(ql_dbg_tgt, cmd->vha, 0xe027, "New cmd->sg_cnt: %u\n",
        cmd->sg_cnt);
    ql_dbg(ql_dbg_tgt, cmd->vha, 0xe028, "New cmd->bufflen: %u\n",
        cmd->bufflen);
    ql_dbg(ql_dbg_tgt, cmd->vha, 0xe029, "New cmd->offset: %u\n",
        cmd->offset);

    if (cmd->sg_cnt < 0)
        BUG();

    if (cmd->bufflen < 0)
        BUG();

    return 0;
}

static inline int qlt_srr_adjust_data(struct qla_tgt_cmd *cmd,
    uint32_t srr_rel_offs, int *xmit_type)
{
    int res = 0, rel_offs;

    rel_offs = srr_rel_offs - cmd->offset;
    ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf027, "srr_rel_offs=%d, rel_offs=%d",
        srr_rel_offs, rel_offs);

    *xmit_type = QLA_TGT_XMIT_ALL;

    if (rel_offs < 0) {
        ql_dbg(ql_dbg_tgt_mgt, cmd->vha, 0xf062,
            "qla_target(%d): SRR rel_offs (%d) < 0",
            cmd->vha->vp_idx, rel_offs);
        res = -1;
    } else if (rel_offs == cmd->bufflen)
        *xmit_type = QLA_TGT_XMIT_STATUS;
    else if (rel_offs > 0)
        res = qlt_set_data_offset(cmd, rel_offs);

    return res;
}

/* No locks, thread context */
static void qlt_handle_srr(struct scsi_qla_host *vha,
    struct qla_tgt_srr_ctio *sctio, struct qla_tgt_srr_imm *imm)
{
    struct imm_ntfy_from_isp *ntfy =
        (struct imm_ntfy_from_isp *)&imm->imm_ntfy;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_cmd *cmd = sctio->cmd;
    struct se_cmd *se_cmd = &cmd->se_cmd;
    unsigned long flags;
    int xmit_type = 0, resp = 0;
    uint32_t offset;
    uint16_t srr_ui;

    offset = le32_to_cpu(ntfy->u.isp24.srr_rel_offs);
    srr_ui = ntfy->u.isp24.srr_ui;

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf028, "SRR cmd %p, srr_ui %x\n",
        cmd, srr_ui);

    switch (srr_ui) {
    case SRR_IU_STATUS:
        spin_lock_irqsave(&ha->hardware_lock, flags);
        qlt_send_notify_ack(vha, ntfy,
            0, 0, 0, NOTIFY_ACK_SRR_FLAGS_ACCEPT, 0, 0);
        spin_unlock_irqrestore(&ha->hardware_lock, flags);
        xmit_type = QLA_TGT_XMIT_STATUS;
        resp = 1;
        break;
    case SRR_IU_DATA_IN:
        if (!cmd->sg || !cmd->sg_cnt) {
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf063,
                "Unable to process SRR_IU_DATA_IN due to"
                " missing cmd->sg, state: %d\n", cmd->state);
            dump_stack();
            goto out_reject;
        }
        if (se_cmd->scsi_status != 0) {
            ql_dbg(ql_dbg_tgt, vha, 0xe02a,
                "Rejecting SRR_IU_DATA_IN with non GOOD "
                "scsi_status\n");
            goto out_reject;
        }
        cmd->bufflen = se_cmd->data_length;

        if (qlt_has_data(cmd)) {
            if (qlt_srr_adjust_data(cmd, offset, &xmit_type) != 0)
                goto out_reject;
            spin_lock_irqsave(&ha->hardware_lock, flags);
            qlt_send_notify_ack(vha, ntfy,
                0, 0, 0, NOTIFY_ACK_SRR_FLAGS_ACCEPT, 0, 0);
            spin_unlock_irqrestore(&ha->hardware_lock, flags);
            resp = 1;
        } else {
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf064,
                "qla_target(%d): SRR for in data for cmd "
                "without them (tag %d, SCSI status %d), "
                "reject", vha->vp_idx, cmd->tag,
                cmd->se_cmd.scsi_status);
            goto out_reject;
        }
        break;
    case SRR_IU_DATA_OUT:
        if (!cmd->sg || !cmd->sg_cnt) {
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf065,
                "Unable to process SRR_IU_DATA_OUT due to"
                " missing cmd->sg\n");
            dump_stack();
            goto out_reject;
        }
        if (se_cmd->scsi_status != 0) {
            ql_dbg(ql_dbg_tgt, vha, 0xe02b,
                "Rejecting SRR_IU_DATA_OUT"
                " with non GOOD scsi_status\n");
            goto out_reject;
        }
        cmd->bufflen = se_cmd->data_length;

        if (qlt_has_data(cmd)) {
            if (qlt_srr_adjust_data(cmd, offset, &xmit_type) != 0)
                goto out_reject;
            spin_lock_irqsave(&ha->hardware_lock, flags);
            qlt_send_notify_ack(vha, ntfy,
                0, 0, 0, NOTIFY_ACK_SRR_FLAGS_ACCEPT, 0, 0);
            spin_unlock_irqrestore(&ha->hardware_lock, flags);
            if (xmit_type & QLA_TGT_XMIT_DATA)
                qlt_rdy_to_xfer(cmd);
        } else {
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf066,
                "qla_target(%d): SRR for out data for cmd "
                "without them (tag %d, SCSI status %d), "
                "reject", vha->vp_idx, cmd->tag,
                cmd->se_cmd.scsi_status);
            goto out_reject;
        }
        break;
    default:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf067,
            "qla_target(%d): Unknown srr_ui value %x",
            vha->vp_idx, srr_ui);
        goto out_reject;
    }

    /* Transmit response in case of status and data-in cases */
    if (resp)
        qlt_xmit_response(cmd, xmit_type, se_cmd->scsi_status);

    return;

out_reject:
    spin_lock_irqsave(&ha->hardware_lock, flags);
    qlt_send_notify_ack(vha, ntfy, 0, 0, 0,
        NOTIFY_ACK_SRR_FLAGS_REJECT,
        NOTIFY_ACK_SRR_REJECT_REASON_UNABLE_TO_PERFORM,
        NOTIFY_ACK_SRR_FLAGS_REJECT_EXPL_NO_EXPL);
    if (cmd->state == QLA_TGT_STATE_NEED_DATA) {
        cmd->state = QLA_TGT_STATE_DATA_IN;
        dump_stack();
    } else
        qlt_send_term_exchange(vha, cmd, &cmd->atio, 1);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
}

static void qlt_reject_free_srr_imm(struct scsi_qla_host *vha,
    struct qla_tgt_srr_imm *imm, int ha_locked)
{
    struct qla_hw_data *ha = vha->hw;
    unsigned long flags = 0;

    if (!ha_locked)
        spin_lock_irqsave(&ha->hardware_lock, flags);

    qlt_send_notify_ack(vha, (void *)&imm->imm_ntfy, 0, 0, 0,
        NOTIFY_ACK_SRR_FLAGS_REJECT,
        NOTIFY_ACK_SRR_REJECT_REASON_UNABLE_TO_PERFORM,
        NOTIFY_ACK_SRR_FLAGS_REJECT_EXPL_NO_EXPL);

    if (!ha_locked)
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

    kfree(imm);
}

static void qlt_handle_srr_work(struct work_struct *work)
{
    struct qla_tgt *tgt = container_of(work, struct qla_tgt, srr_work);
    struct scsi_qla_host *vha = tgt->vha;
    struct qla_tgt_srr_ctio *sctio;
    unsigned long flags;

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf029, "Entering SRR work (tgt %p)\n",
        tgt);

restart:
    spin_lock_irqsave(&tgt->srr_lock, flags);
    list_for_each_entry(sctio, &tgt->srr_ctio_list, srr_list_entry) {
        struct qla_tgt_srr_imm *imm, *i, *ti;
        struct qla_tgt_cmd *cmd;
        struct se_cmd *se_cmd;

        imm = NULL;
        list_for_each_entry_safe(i, ti, &tgt->srr_imm_list,
                        srr_list_entry) {
            if (i->srr_id == sctio->srr_id) {
                list_del(&i->srr_list_entry);
                if (imm) {
                    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf068,
                      "qla_target(%d): There must be "
                      "only one IMM SRR per CTIO SRR "
                      "(IMM SRR %p, id %d, CTIO %p\n",
                      vha->vp_idx, i, i->srr_id, sctio);
                    qlt_reject_free_srr_imm(tgt->vha, i, 0);
                } else
                    imm = i;
            }
        }

        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf02a,
            "IMM SRR %p, CTIO SRR %p (id %d)\n", imm, sctio,
            sctio->srr_id);

        if (imm == NULL) {
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf02b,
                "Not found matching IMM for SRR CTIO (id %d)\n",
                sctio->srr_id);
            continue;
        } else
            list_del(&sctio->srr_list_entry);

        spin_unlock_irqrestore(&tgt->srr_lock, flags);

        cmd = sctio->cmd;
        /*
         * Reset qla_tgt_cmd SRR values and SGL pointer+count to follow
         * tcm_qla2xxx_write_pending() and tcm_qla2xxx_queue_data_in()
         * logic..
         */
        cmd->offset = 0;
        if (cmd->free_sg) {
            kfree(cmd->sg);
            cmd->sg = NULL;
            cmd->free_sg = 0;
        }
        se_cmd = &cmd->se_cmd;

        cmd->sg_cnt = se_cmd->t_data_nents;
        cmd->sg = se_cmd->t_data_sg;

        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf02c,
            "SRR cmd %p (se_cmd %p, tag %d, op %x), "
            "sg_cnt=%d, offset=%d", cmd, &cmd->se_cmd, cmd->tag,
            se_cmd->t_task_cdb[0], cmd->sg_cnt, cmd->offset);

        qlt_handle_srr(vha, sctio, imm);

        kfree(imm);
        kfree(sctio);
        goto restart;
    }
    spin_unlock_irqrestore(&tgt->srr_lock, flags);
}

/* ha->hardware_lock supposed to be held on entry */
static void qlt_prepare_srr_imm(struct scsi_qla_host *vha,
    struct imm_ntfy_from_isp *iocb)
{
    struct qla_tgt_srr_imm *imm;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    struct qla_tgt_srr_ctio *sctio;

    tgt->imm_srr_id++;

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf02d, "qla_target(%d): SRR received\n",
        vha->vp_idx);

    imm = kzalloc(sizeof(*imm), GFP_ATOMIC);
    if (imm != NULL) {
        memcpy(&imm->imm_ntfy, iocb, sizeof(imm->imm_ntfy));

        /* IRQ is already OFF */
        spin_lock(&tgt->srr_lock);
        imm->srr_id = tgt->imm_srr_id;
        list_add_tail(&imm->srr_list_entry,
            &tgt->srr_imm_list);
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf02e,
            "IMM NTFY SRR %p added (id %d, ui %x)\n",
            imm, imm->srr_id, iocb->u.isp24.srr_ui);
        if (tgt->imm_srr_id == tgt->ctio_srr_id) {
            int found = 0;
            list_for_each_entry(sctio, &tgt->srr_ctio_list,
                srr_list_entry) {
                if (sctio->srr_id == imm->srr_id) {
                    found = 1;
                    break;
                }
            }
            if (found) {
                ql_dbg(ql_dbg_tgt_mgt, vha, 0xf02f, "%s",
                    "Scheduling srr work\n");
                schedule_work(&tgt->srr_work);
            } else {
                ql_dbg(ql_dbg_tgt_mgt, vha, 0xf030,
                    "qla_target(%d): imm_srr_id "
                    "== ctio_srr_id (%d), but there is no "
                    "corresponding SRR CTIO, deleting IMM "
                    "SRR %p\n", vha->vp_idx, tgt->ctio_srr_id,
                    imm);
                list_del(&imm->srr_list_entry);

                kfree(imm);

                spin_unlock(&tgt->srr_lock);
                goto out_reject;
            }
        }
        spin_unlock(&tgt->srr_lock);
    } else {
        struct qla_tgt_srr_ctio *ts;

        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf069,
            "qla_target(%d): Unable to allocate SRR IMM "
            "entry, SRR request will be rejected\n", vha->vp_idx);

        /* IRQ is already OFF */
        spin_lock(&tgt->srr_lock);
        list_for_each_entry_safe(sctio, ts, &tgt->srr_ctio_list,
            srr_list_entry) {
            if (sctio->srr_id == tgt->imm_srr_id) {
                ql_dbg(ql_dbg_tgt_mgt, vha, 0xf031,
                    "CTIO SRR %p deleted (id %d)\n",
                    sctio, sctio->srr_id);
                list_del(&sctio->srr_list_entry);
                qlt_send_term_exchange(vha, sctio->cmd,
                    &sctio->cmd->atio, 1);
                kfree(sctio);
            }
        }
        spin_unlock(&tgt->srr_lock);
        goto out_reject;
    }

    return;

out_reject:
    qlt_send_notify_ack(vha, iocb, 0, 0, 0,
        NOTIFY_ACK_SRR_FLAGS_REJECT,
        NOTIFY_ACK_SRR_REJECT_REASON_UNABLE_TO_PERFORM,
        NOTIFY_ACK_SRR_FLAGS_REJECT_EXPL_NO_EXPL);
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
static void qlt_handle_imm_notify(struct scsi_qla_host *vha,
    struct imm_ntfy_from_isp *iocb)
{
    struct qla_hw_data *ha = vha->hw;
    uint32_t add_flags = 0;
    int send_notify_ack = 1;
    uint16_t status;

    status = le16_to_cpu(iocb->u.isp2x.status);
    switch (status) {
    case IMM_NTFY_LIP_RESET:
    {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf032,
            "qla_target(%d): LIP reset (loop %#x), subcode %x\n",
            vha->vp_idx, le16_to_cpu(iocb->u.isp24.nport_handle),
            iocb->u.isp24.status_subcode);

        if (qlt_reset(vha, iocb, QLA_TGT_ABORT_ALL) == 0)
            send_notify_ack = 0;
        break;
    }

    case IMM_NTFY_LIP_LINK_REINIT:
    {
        struct qla_tgt *tgt = ha->tgt.qla_tgt;
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf033,
            "qla_target(%d): LINK REINIT (loop %#x, "
            "subcode %x)\n", vha->vp_idx,
            le16_to_cpu(iocb->u.isp24.nport_handle),
            iocb->u.isp24.status_subcode);
        if (tgt->link_reinit_iocb_pending) {
            qlt_send_notify_ack(vha, &tgt->link_reinit_iocb,
                0, 0, 0, 0, 0, 0);
        }
        memcpy(&tgt->link_reinit_iocb, iocb, sizeof(*iocb));
        tgt->link_reinit_iocb_pending = 1;
        /*
         * QLogic requires to wait after LINK REINIT for possible
         * PDISC or ADISC ELS commands
         */
        send_notify_ack = 0;
        break;
    }

    case IMM_NTFY_PORT_LOGOUT:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf034,
            "qla_target(%d): Port logout (loop "
            "%#x, subcode %x)\n", vha->vp_idx,
            le16_to_cpu(iocb->u.isp24.nport_handle),
            iocb->u.isp24.status_subcode);

        if (qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS_SESS) == 0)
            send_notify_ack = 0;
        /* The sessions will be cleared in the callback, if needed */
        break;

    case IMM_NTFY_GLBL_TPRLO:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf035,
            "qla_target(%d): Global TPRLO (%x)\n", vha->vp_idx, status);
        if (qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS) == 0)
            send_notify_ack = 0;
        /* The sessions will be cleared in the callback, if needed */
        break;

    case IMM_NTFY_PORT_CONFIG:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf036,
            "qla_target(%d): Port config changed (%x)\n", vha->vp_idx,
            status);
        if (qlt_reset(vha, iocb, QLA_TGT_ABORT_ALL) == 0)
            send_notify_ack = 0;
        /* The sessions will be cleared in the callback, if needed */
        break;

    case IMM_NTFY_GLBL_LOGO:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06a,
            "qla_target(%d): Link failure detected\n",
            vha->vp_idx);
        /* I_T nexus loss */
        if (qlt_reset(vha, iocb, QLA_TGT_NEXUS_LOSS) == 0)
            send_notify_ack = 0;
        break;

    case IMM_NTFY_IOCB_OVERFLOW:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06b,
            "qla_target(%d): Cannot provide requested "
            "capability (IOCB overflowed the immediate notify "
            "resource count)\n", vha->vp_idx);
        break;

    case IMM_NTFY_ABORT_TASK:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf037,
            "qla_target(%d): Abort Task (S %08x I %#x -> "
            "L %#x)\n", vha->vp_idx,
            le16_to_cpu(iocb->u.isp2x.seq_id),
            GET_TARGET_ID(ha, (struct atio_from_isp *)iocb),
            le16_to_cpu(iocb->u.isp2x.lun));
        if (qlt_abort_task(vha, iocb) == 0)
            send_notify_ack = 0;
        break;

    case IMM_NTFY_RESOURCE:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06c,
            "qla_target(%d): Out of resources, host %ld\n",
            vha->vp_idx, vha->host_no);
        break;

    case IMM_NTFY_MSG_RX:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf038,
            "qla_target(%d): Immediate notify task %x\n",
            vha->vp_idx, iocb->u.isp2x.task_flags);
        if (qlt_handle_task_mgmt(vha, iocb) == 0)
            send_notify_ack = 0;
        break;

    case IMM_NTFY_ELS:
        if (qlt_24xx_handle_els(vha, iocb) == 0)
            send_notify_ack = 0;
        break;

    case IMM_NTFY_SRR:
        qlt_prepare_srr_imm(vha, iocb);
        send_notify_ack = 0;
        break;

    default:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06d,
            "qla_target(%d): Received unknown immediate "
            "notify status %x\n", vha->vp_idx, status);
        break;
    }

    if (send_notify_ack)
        qlt_send_notify_ack(vha, iocb, add_flags, 0, 0, 0, 0, 0);
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 * This function sends busy to ISP 2xxx or 24xx.
 */
static void qlt_send_busy(struct scsi_qla_host *vha,
    struct atio_from_isp *atio, uint16_t status)
{
    struct ctio7_to_24xx *ctio24;
    struct qla_hw_data *ha = vha->hw;
    request_t *pkt;
    struct qla_tgt_sess *sess = NULL;

    sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha,
        atio->u.isp24.fcp_hdr.s_id);
    if (!sess) {
        qlt_send_term_exchange(vha, NULL, atio, 1);
        return;
    }
    /* Sending marker isn't necessary, since we called from ISR */

    pkt = (request_t *)qla2x00_alloc_iocbs(vha, NULL);
    if (!pkt) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06e,
            "qla_target(%d): %s failed: unable to allocate "
            "request packet", vha->vp_idx, __func__);
        return;
    }

    pkt->entry_count = 1;
    pkt->handle = QLA_TGT_SKIP_HANDLE | CTIO_COMPLETION_HANDLE_MARK;

    ctio24 = (struct ctio7_to_24xx *)pkt;
    ctio24->entry_type = CTIO_TYPE7;
    ctio24->nport_handle = sess->loop_id;
    ctio24->timeout = __constant_cpu_to_le16(QLA_TGT_TIMEOUT);
    ctio24->vp_index = vha->vp_idx;
    ctio24->initiator_id[0] = atio->u.isp24.fcp_hdr.s_id[2];
    ctio24->initiator_id[1] = atio->u.isp24.fcp_hdr.s_id[1];
    ctio24->initiator_id[2] = atio->u.isp24.fcp_hdr.s_id[0];
    ctio24->exchange_addr = atio->u.isp24.exchange_addr;
    ctio24->u.status1.flags = (atio->u.isp24.attr << 9) |
        __constant_cpu_to_le16(
        CTIO7_FLAGS_STATUS_MODE_1 | CTIO7_FLAGS_SEND_STATUS |
        CTIO7_FLAGS_DONT_RET_CTIO);
    /*
     * CTIO from fw w/o se_cmd doesn't provide enough info to retry it,
     * if the explicit conformation is used.
     */
    ctio24->u.status1.ox_id = swab16(atio->u.isp24.fcp_hdr.ox_id);
    ctio24->u.status1.scsi_status = cpu_to_le16(status);
    ctio24->u.status1.residual = get_unaligned((uint32_t *)
        &atio->u.isp24.fcp_cmnd.add_cdb[
        atio->u.isp24.fcp_cmnd.add_cdb_len]);
    if (ctio24->u.status1.residual != 0)
        ctio24->u.status1.scsi_status |= SS_RESIDUAL_UNDER;

    qla2x00_start_iocbs(vha, vha->req);
}

/* ha->hardware_lock supposed to be held on entry */
/* called via callback from qla2xxx */
static void qlt_24xx_atio_pkt(struct scsi_qla_host *vha,
    struct atio_from_isp *atio)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    int rc;

    if (unlikely(tgt == NULL)) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf039,
            "ATIO pkt, but no tgt (ha %p)", ha);
        return;
    }
    ql_dbg(ql_dbg_tgt, vha, 0xe02c,
        "qla_target(%d): ATIO pkt %p: type %02x count %02x",
        vha->vp_idx, atio, atio->u.raw.entry_type,
        atio->u.raw.entry_count);
    /*
     * In tgt_stop mode we also should allow all requests to pass.
     * Otherwise, some commands can stuck.
     */

    tgt->irq_cmd_count++;

    switch (atio->u.raw.entry_type) {
    case ATIO_TYPE7:
        ql_dbg(ql_dbg_tgt, vha, 0xe02d,
            "ATIO_TYPE7 instance %d, lun %Lx, read/write %d/%d, "
            "add_cdb_len %d, data_length %04x, s_id %x:%x:%x\n",
            vha->vp_idx, atio->u.isp24.fcp_cmnd.lun,
            atio->u.isp24.fcp_cmnd.rddata,
            atio->u.isp24.fcp_cmnd.wrdata,
            atio->u.isp24.fcp_cmnd.add_cdb_len,
            be32_to_cpu(get_unaligned((uint32_t *)
            &atio->u.isp24.fcp_cmnd.add_cdb[
            atio->u.isp24.fcp_cmnd.add_cdb_len])),
            atio->u.isp24.fcp_hdr.s_id[0],
            atio->u.isp24.fcp_hdr.s_id[1],
            atio->u.isp24.fcp_hdr.s_id[2]);

        if (unlikely(atio->u.isp24.exchange_addr ==
            ATIO_EXCHANGE_ADDRESS_UNKNOWN)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe058,
                "qla_target(%d): ATIO_TYPE7 "
                "received with UNKNOWN exchange address, "
                "sending QUEUE_FULL\n", vha->vp_idx);
            qlt_send_busy(vha, atio, SAM_STAT_TASK_SET_FULL);
            break;
        }
        if (likely(atio->u.isp24.fcp_cmnd.task_mgmt_flags == 0))
            rc = qlt_handle_cmd_for_atio(vha, atio);
        else
            rc = qlt_handle_task_mgmt(vha, atio);
        if (unlikely(rc != 0)) {
            if (rc == -ESRCH) {
#if 1 /* With TERM EXCHANGE some FC cards refuse to boot */
                qlt_send_busy(vha, atio, SAM_STAT_BUSY);
#else
                qlt_send_term_exchange(vha, NULL, atio, 1);
#endif
            } else {
                if (tgt->tgt_stop) {
                    ql_dbg(ql_dbg_tgt, vha, 0xe059,
                        "qla_target: Unable to send "
                        "command to target for req, "
                        "ignoring.\n");
                } else {
                    ql_dbg(ql_dbg_tgt, vha, 0xe05a,
                        "qla_target(%d): Unable to send "
                        "command to target, sending BUSY "
                        "status.\n", vha->vp_idx);
                    qlt_send_busy(vha, atio, SAM_STAT_BUSY);
                }
            }
        }
        break;

    case IMMED_NOTIFY_TYPE:
    {
        if (unlikely(atio->u.isp2x.entry_status != 0)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe05b,
                "qla_target(%d): Received ATIO packet %x "
                "with error status %x\n", vha->vp_idx,
                atio->u.raw.entry_type,
                atio->u.isp2x.entry_status);
            break;
        }
        ql_dbg(ql_dbg_tgt, vha, 0xe02e, "%s", "IMMED_NOTIFY ATIO");
        qlt_handle_imm_notify(vha, (struct imm_ntfy_from_isp *)atio);
        break;
    }

    default:
        ql_dbg(ql_dbg_tgt, vha, 0xe05c,
            "qla_target(%d): Received unknown ATIO atio "
            "type %x\n", vha->vp_idx, atio->u.raw.entry_type);
        break;
    }

    tgt->irq_cmd_count--;
}

/* ha->hardware_lock supposed to be held on entry */
/* called via callback from qla2xxx */
static void qlt_response_pkt(struct scsi_qla_host *vha, response_t *pkt)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;

    if (unlikely(tgt == NULL)) {
        ql_dbg(ql_dbg_tgt, vha, 0xe05d,
            "qla_target(%d): Response pkt %x received, but no "
            "tgt (ha %p)\n", vha->vp_idx, pkt->entry_type, ha);
        return;
    }

    ql_dbg(ql_dbg_tgt, vha, 0xe02f,
        "qla_target(%d): response pkt %p: T %02x C %02x S %02x "
        "handle %#x\n", vha->vp_idx, pkt, pkt->entry_type,
        pkt->entry_count, pkt->entry_status, pkt->handle);

    /*
     * In tgt_stop mode we also should allow all requests to pass.
     * Otherwise, some commands can stuck.
     */

    tgt->irq_cmd_count++;

    switch (pkt->entry_type) {
    case CTIO_TYPE7:
    {
        struct ctio7_from_24xx *entry = (struct ctio7_from_24xx *)pkt;
        ql_dbg(ql_dbg_tgt, vha, 0xe030, "CTIO_TYPE7: instance %d\n",
            vha->vp_idx);
        qlt_do_ctio_completion(vha, entry->handle,
            le16_to_cpu(entry->status)|(pkt->entry_status << 16),
            entry);
        break;
    }

    case ACCEPT_TGT_IO_TYPE:
    {
        struct atio_from_isp *atio = (struct atio_from_isp *)pkt;
        int rc;
        ql_dbg(ql_dbg_tgt, vha, 0xe031,
            "ACCEPT_TGT_IO instance %d status %04x "
            "lun %04x read/write %d data_length %04x "
            "target_id %02x rx_id %04x\n ", vha->vp_idx,
            le16_to_cpu(atio->u.isp2x.status),
            le16_to_cpu(atio->u.isp2x.lun),
            atio->u.isp2x.execution_codes,
            le32_to_cpu(atio->u.isp2x.data_length), GET_TARGET_ID(ha,
            atio), atio->u.isp2x.rx_id);
        if (atio->u.isp2x.status !=
            __constant_cpu_to_le16(ATIO_CDB_VALID)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe05e,
                "qla_target(%d): ATIO with error "
                "status %x received\n", vha->vp_idx,
                le16_to_cpu(atio->u.isp2x.status));
            break;
        }
        ql_dbg(ql_dbg_tgt, vha, 0xe032,
            "FCP CDB: 0x%02x, sizeof(cdb): %lu",
            atio->u.isp2x.cdb[0], (unsigned long
            int)sizeof(atio->u.isp2x.cdb));

        rc = qlt_handle_cmd_for_atio(vha, atio);
        if (unlikely(rc != 0)) {
            if (rc == -ESRCH) {
#if 1 /* With TERM EXCHANGE some FC cards refuse to boot */
                qlt_send_busy(vha, atio, 0);
#else
                qlt_send_term_exchange(vha, NULL, atio, 1);
#endif
            } else {
                if (tgt->tgt_stop) {
                    ql_dbg(ql_dbg_tgt, vha, 0xe05f,
                        "qla_target: Unable to send "
                        "command to target, sending TERM "
                        "EXCHANGE for rsp\n");
                    qlt_send_term_exchange(vha, NULL,
                        atio, 1);
                } else {
                    ql_dbg(ql_dbg_tgt, vha, 0xe060,
                        "qla_target(%d): Unable to send "
                        "command to target, sending BUSY "
                        "status\n", vha->vp_idx);
                    qlt_send_busy(vha, atio, 0);
                }
            }
        }
    }
    break;

    case CONTINUE_TGT_IO_TYPE:
    {
        struct ctio_to_2xxx *entry = (struct ctio_to_2xxx *)pkt;
        ql_dbg(ql_dbg_tgt, vha, 0xe033,
            "CONTINUE_TGT_IO: instance %d\n", vha->vp_idx);
        qlt_do_ctio_completion(vha, entry->handle,
            le16_to_cpu(entry->status)|(pkt->entry_status << 16),
            entry);
        break;
    }

    case CTIO_A64_TYPE:
    {
        struct ctio_to_2xxx *entry = (struct ctio_to_2xxx *)pkt;
        ql_dbg(ql_dbg_tgt, vha, 0xe034, "CTIO_A64: instance %d\n",
            vha->vp_idx);
        qlt_do_ctio_completion(vha, entry->handle,
            le16_to_cpu(entry->status)|(pkt->entry_status << 16),
            entry);
        break;
    }

    case IMMED_NOTIFY_TYPE:
        ql_dbg(ql_dbg_tgt, vha, 0xe035, "%s", "IMMED_NOTIFY\n");
        qlt_handle_imm_notify(vha, (struct imm_ntfy_from_isp *)pkt);
        break;

    case NOTIFY_ACK_TYPE:
        if (tgt->notify_ack_expected > 0) {
            struct nack_to_isp *entry = (struct nack_to_isp *)pkt;
            ql_dbg(ql_dbg_tgt, vha, 0xe036,
                "NOTIFY_ACK seq %08x status %x\n",
                le16_to_cpu(entry->u.isp2x.seq_id),
                le16_to_cpu(entry->u.isp2x.status));
            tgt->notify_ack_expected--;
            if (entry->u.isp2x.status !=
                __constant_cpu_to_le16(NOTIFY_ACK_SUCCESS)) {
                ql_dbg(ql_dbg_tgt, vha, 0xe061,
                    "qla_target(%d): NOTIFY_ACK "
                    "failed %x\n", vha->vp_idx,
                    le16_to_cpu(entry->u.isp2x.status));
            }
        } else {
            ql_dbg(ql_dbg_tgt, vha, 0xe062,
                "qla_target(%d): Unexpected NOTIFY_ACK received\n",
                vha->vp_idx);
        }
        break;

    case ABTS_RECV_24XX:
        ql_dbg(ql_dbg_tgt, vha, 0xe037,
            "ABTS_RECV_24XX: instance %d\n", vha->vp_idx);
        qlt_24xx_handle_abts(vha, (struct abts_recv_from_24xx *)pkt);
        break;

    case ABTS_RESP_24XX:
        if (tgt->abts_resp_expected > 0) {
            struct abts_resp_from_24xx_fw *entry =
                (struct abts_resp_from_24xx_fw *)pkt;
            ql_dbg(ql_dbg_tgt, vha, 0xe038,
                "ABTS_RESP_24XX: compl_status %x\n",
                entry->compl_status);
            tgt->abts_resp_expected--;
            if (le16_to_cpu(entry->compl_status) !=
                ABTS_RESP_COMPL_SUCCESS) {
                if ((entry->error_subcode1 == 0x1E) &&
                    (entry->error_subcode2 == 0)) {
                    /*
                     * We've got a race here: aborted
                     * exchange not terminated, i.e.
                     * response for the aborted command was
                     * sent between the abort request was
                     * received and processed.
                     * Unfortunately, the firmware has a
                     * silly requirement that all aborted
                     * exchanges must be explicitely
                     * terminated, otherwise it refuses to
                     * send responses for the abort
                     * requests. So, we have to
                     * (re)terminate the exchange and retry
                     * the abort response.
                     */
                    qlt_24xx_retry_term_exchange(vha,
                        entry);
                } else
                    ql_dbg(ql_dbg_tgt, vha, 0xe063,
                        "qla_target(%d): ABTS_RESP_24XX "
                        "failed %x (subcode %x:%x)",
                        vha->vp_idx, entry->compl_status,
                        entry->error_subcode1,
                        entry->error_subcode2);
            }
        } else {
            ql_dbg(ql_dbg_tgt, vha, 0xe064,
                "qla_target(%d): Unexpected ABTS_RESP_24XX "
                "received\n", vha->vp_idx);
        }
        break;

    default:
        ql_dbg(ql_dbg_tgt, vha, 0xe065,
            "qla_target(%d): Received unknown response pkt "
            "type %x\n", vha->vp_idx, pkt->entry_type);
        break;
    }

    tgt->irq_cmd_count--;
}

/*
 * ha->hardware_lock supposed to be held on entry. Might drop it, then reaquire
 */
void qlt_async_event(uint16_t code, struct scsi_qla_host *vha,
    uint16_t *mailbox)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    int login_code;

    ql_dbg(ql_dbg_tgt, vha, 0xe039,
        "scsi(%ld): ha state %d init_done %d oper_mode %d topo %d\n",
        vha->host_no, atomic_read(&vha->loop_state), vha->flags.init_done,
        ha->operating_mode, ha->current_topology);

    if (!ha->tgt.tgt_ops)
        return;

    if (unlikely(tgt == NULL)) {
        ql_dbg(ql_dbg_tgt, vha, 0xe03a,
            "ASYNC EVENT %#x, but no tgt (ha %p)\n", code, ha);
        return;
    }

    if (((code == MBA_POINT_TO_POINT) || (code == MBA_CHG_IN_CONNECTION)) &&
        IS_QLA2100(ha))
        return;
    /*
     * In tgt_stop mode we also should allow all requests to pass.
     * Otherwise, some commands can stuck.
     */

    tgt->irq_cmd_count++;

    switch (code) {
    case MBA_RESET:         /* Reset */
    case MBA_SYSTEM_ERR:        /* System Error */
    case MBA_REQ_TRANSFER_ERR:  /* Request Transfer Error */
    case MBA_RSP_TRANSFER_ERR:  /* Response Transfer Error */
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03a,
            "qla_target(%d): System error async event %#x "
            "occured", vha->vp_idx, code);
        break;
    case MBA_WAKEUP_THRES:      /* Request Queue Wake-up. */
        set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
        break;

    case MBA_LOOP_UP:
    {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03b,
            "qla_target(%d): Async LOOP_UP occured "
            "(m[0]=%x, m[1]=%x, m[2]=%x, m[3]=%x)", vha->vp_idx,
            le16_to_cpu(mailbox[0]), le16_to_cpu(mailbox[1]),
            le16_to_cpu(mailbox[2]), le16_to_cpu(mailbox[3]));
        if (tgt->link_reinit_iocb_pending) {
            qlt_send_notify_ack(vha, (void *)&tgt->link_reinit_iocb,
                0, 0, 0, 0, 0, 0);
            tgt->link_reinit_iocb_pending = 0;
        }
        break;
    }

    case MBA_LIP_OCCURRED:
    case MBA_LOOP_DOWN:
    case MBA_LIP_RESET:
    case MBA_RSCN_UPDATE:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03c,
            "qla_target(%d): Async event %#x occured "
            "(m[0]=%x, m[1]=%x, m[2]=%x, m[3]=%x)", vha->vp_idx, code,
            le16_to_cpu(mailbox[0]), le16_to_cpu(mailbox[1]),
            le16_to_cpu(mailbox[2]), le16_to_cpu(mailbox[3]));
        break;

    case MBA_PORT_UPDATE:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03d,
            "qla_target(%d): Port update async event %#x "
            "occured: updating the ports database (m[0]=%x, m[1]=%x, "
            "m[2]=%x, m[3]=%x)", vha->vp_idx, code,
            le16_to_cpu(mailbox[0]), le16_to_cpu(mailbox[1]),
            le16_to_cpu(mailbox[2]), le16_to_cpu(mailbox[3]));

        login_code = le16_to_cpu(mailbox[2]);
        if (login_code == 0x4)
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03e,
                "Async MB 2: Got PLOGI Complete\n");
        else if (login_code == 0x7)
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf03f,
                "Async MB 2: Port Logged Out\n");
        break;

    default:
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf040,
            "qla_target(%d): Async event %#x occured: "
            "ignore (m[0]=%x, m[1]=%x, m[2]=%x, m[3]=%x)", vha->vp_idx,
            code, le16_to_cpu(mailbox[0]), le16_to_cpu(mailbox[1]),
            le16_to_cpu(mailbox[2]), le16_to_cpu(mailbox[3]));
        break;
    }

    tgt->irq_cmd_count--;
}

static fc_port_t *qlt_get_port_database(struct scsi_qla_host *vha,
    uint16_t loop_id)
{
    fc_port_t *fcport;
    int rc;

    fcport = kzalloc(sizeof(*fcport), GFP_KERNEL);
    if (!fcport) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf06f,
            "qla_target(%d): Allocation of tmp FC port failed",
            vha->vp_idx);
        return NULL;
    }

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf041, "loop_id %d", loop_id);

    fcport->loop_id = loop_id;

    rc = qla2x00_get_port_database(vha, fcport, 0);
    if (rc != QLA_SUCCESS) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf070,
            "qla_target(%d): Failed to retrieve fcport "
            "information -- get_port_database() returned %x "
            "(loop_id=0x%04x)", vha->vp_idx, rc, loop_id);
        kfree(fcport);
        return NULL;
    }

    return fcport;
}

/* Must be called under tgt_mutex */
static struct qla_tgt_sess *qlt_make_local_sess(struct scsi_qla_host *vha,
    uint8_t *s_id)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_sess *sess = NULL;
    fc_port_t *fcport = NULL;
    int rc, global_resets;
    uint16_t loop_id = 0;

retry:
    global_resets = atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count);

    rc = qla24xx_get_loop_id(vha, s_id, &loop_id);
    if (rc != 0) {
        if ((s_id[0] == 0xFF) &&
            (s_id[1] == 0xFC)) {
            /*
             * This is Domain Controller, so it should be
             * OK to drop SCSI commands from it.
             */
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf042,
                "Unable to find initiator with S_ID %x:%x:%x",
                s_id[0], s_id[1], s_id[2]);
        } else
            ql_dbg(ql_dbg_tgt_mgt, vha, 0xf071,
                "qla_target(%d): Unable to find "
                "initiator with S_ID %x:%x:%x",
                vha->vp_idx, s_id[0], s_id[1],
                s_id[2]);
        return NULL;
    }

    fcport = qlt_get_port_database(vha, loop_id);
    if (!fcport)
        return NULL;

    if (global_resets !=
        atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count)) {
        ql_dbg(ql_dbg_tgt_mgt, vha, 0xf043,
            "qla_target(%d): global reset during session discovery "
            "(counter was %d, new %d), retrying", vha->vp_idx,
            global_resets,
            atomic_read(&ha->tgt.qla_tgt->tgt_global_resets_count));
        goto retry;
    }

    sess = qlt_create_sess(vha, fcport, true);

    kfree(fcport);
    return sess;
}

static void qlt_abort_work(struct qla_tgt *tgt,
    struct qla_tgt_sess_work_param *prm)
{
    struct scsi_qla_host *vha = tgt->vha;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_sess *sess = NULL;
    unsigned long flags;
    uint32_t be_s_id;
    uint8_t s_id[3];
    int rc;

    spin_lock_irqsave(&ha->hardware_lock, flags);

    if (tgt->tgt_stop)
        goto out_term;

    s_id[0] = prm->abts.fcp_hdr_le.s_id[2];
    s_id[1] = prm->abts.fcp_hdr_le.s_id[1];
    s_id[2] = prm->abts.fcp_hdr_le.s_id[0];

    sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha,
        (unsigned char *)&be_s_id);
    if (!sess) {
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        mutex_lock(&ha->tgt.tgt_mutex);
        sess = qlt_make_local_sess(vha, s_id);
        /* sess has got an extra creation ref */
        mutex_unlock(&ha->tgt.tgt_mutex);

        spin_lock_irqsave(&ha->hardware_lock, flags);
        if (!sess)
            goto out_term;
    } else {
        kref_get(&sess->se_sess->sess_kref);
    }

    if (tgt->tgt_stop)
        goto out_term;

    rc = __qlt_24xx_handle_abts(vha, &prm->abts, sess);
    if (rc != 0)
        goto out_term;
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    ha->tgt.tgt_ops->put_sess(sess);
    return;

out_term:
    qlt_24xx_send_abts_resp(vha, &prm->abts, FCP_TMF_REJECTED, false);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
    if (sess)
        ha->tgt.tgt_ops->put_sess(sess);
}

static void qlt_tmr_work(struct qla_tgt *tgt,
    struct qla_tgt_sess_work_param *prm)
{
    struct atio_from_isp *a = &prm->tm_iocb2;
    struct scsi_qla_host *vha = tgt->vha;
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt_sess *sess = NULL;
    unsigned long flags;
    uint8_t *s_id = NULL; /* to hide compiler warnings */
    int rc;
    uint32_t lun, unpacked_lun;
    int lun_size, fn;
    void *iocb;

    spin_lock_irqsave(&ha->hardware_lock, flags);

    if (tgt->tgt_stop)
        goto out_term;

    s_id = prm->tm_iocb2.u.isp24.fcp_hdr.s_id;
    sess = ha->tgt.tgt_ops->find_sess_by_s_id(vha, s_id);
    if (!sess) {
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        mutex_lock(&ha->tgt.tgt_mutex);
        sess = qlt_make_local_sess(vha, s_id);
        /* sess has got an extra creation ref */
        mutex_unlock(&ha->tgt.tgt_mutex);

        spin_lock_irqsave(&ha->hardware_lock, flags);
        if (!sess)
            goto out_term;
    } else {
        kref_get(&sess->se_sess->sess_kref);
    }

    iocb = a;
    lun = a->u.isp24.fcp_cmnd.lun;
    lun_size = sizeof(lun);
    fn = a->u.isp24.fcp_cmnd.task_mgmt_flags;
    unpacked_lun = scsilun_to_int((struct scsi_lun *)&lun);

    rc = qlt_issue_task_mgmt(sess, unpacked_lun, fn, iocb, 0);
    if (rc != 0)
        goto out_term;
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    ha->tgt.tgt_ops->put_sess(sess);
    return;

out_term:
    qlt_send_term_exchange(vha, NULL, &prm->tm_iocb2, 1);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);
    if (sess)
        ha->tgt.tgt_ops->put_sess(sess);
}

static void qlt_sess_work_fn(struct work_struct *work)
{
    struct qla_tgt *tgt = container_of(work, struct qla_tgt, sess_work);
    struct scsi_qla_host *vha = tgt->vha;
    unsigned long flags;

    ql_dbg(ql_dbg_tgt_mgt, vha, 0xf000, "Sess work (tgt %p)", tgt);

    spin_lock_irqsave(&tgt->sess_work_lock, flags);
    while (!list_empty(&tgt->sess_works_list)) {
        struct qla_tgt_sess_work_param *prm = list_entry(
            tgt->sess_works_list.next, typeof(*prm),
            sess_works_list_entry);

        /*
         * This work can be scheduled on several CPUs at time, so we
         * must delete the entry to eliminate double processing
         */
        list_del(&prm->sess_works_list_entry);

        spin_unlock_irqrestore(&tgt->sess_work_lock, flags);

        switch (prm->type) {
        case QLA_TGT_SESS_WORK_ABORT:
            qlt_abort_work(tgt, prm);
            break;
        case QLA_TGT_SESS_WORK_TM:
            qlt_tmr_work(tgt, prm);
            break;
        default:
            BUG_ON(1);
            break;
        }

        spin_lock_irqsave(&tgt->sess_work_lock, flags);

        kfree(prm);
    }
    spin_unlock_irqrestore(&tgt->sess_work_lock, flags);
}

/* Must be called under tgt_host_action_mutex */
int qlt_add_target(struct qla_hw_data *ha, struct scsi_qla_host *base_vha)
{
    struct qla_tgt *tgt;

    if (!QLA_TGT_MODE_ENABLED())
        return 0;

    ql_dbg(ql_dbg_tgt, base_vha, 0xe03b,
        "Registering target for host %ld(%p)", base_vha->host_no, ha);

    BUG_ON((ha->tgt.qla_tgt != NULL) || (ha->tgt.tgt_ops != NULL));

    tgt = kzalloc(sizeof(struct qla_tgt), GFP_KERNEL);
    if (!tgt) {
        ql_dbg(ql_dbg_tgt, base_vha, 0xe066,
            "Unable to allocate struct qla_tgt\n");
        return -ENOMEM;
    }

    if (!(base_vha->host->hostt->supported_mode & MODE_TARGET))
        base_vha->host->hostt->supported_mode |= MODE_TARGET;

    tgt->ha = ha;
    tgt->vha = base_vha;
    init_waitqueue_head(&tgt->waitQ);
    INIT_LIST_HEAD(&tgt->sess_list);
    INIT_LIST_HEAD(&tgt->del_sess_list);
    INIT_DELAYED_WORK(&tgt->sess_del_work,
        (void (*)(struct work_struct *))qlt_del_sess_work_fn);
    spin_lock_init(&tgt->sess_work_lock);
    INIT_WORK(&tgt->sess_work, qlt_sess_work_fn);
    INIT_LIST_HEAD(&tgt->sess_works_list);
    spin_lock_init(&tgt->srr_lock);
    INIT_LIST_HEAD(&tgt->srr_ctio_list);
    INIT_LIST_HEAD(&tgt->srr_imm_list);
    INIT_WORK(&tgt->srr_work, qlt_handle_srr_work);
    atomic_set(&tgt->tgt_global_resets_count, 0);

    ha->tgt.qla_tgt = tgt;

    ql_dbg(ql_dbg_tgt, base_vha, 0xe067,
        "qla_target(%d): using 64 Bit PCI addressing",
        base_vha->vp_idx);
    tgt->tgt_enable_64bit_addr = 1;
    /* 3 is reserved */
    tgt->sg_tablesize = QLA_TGT_MAX_SG_24XX(base_vha->req->length - 3);
    tgt->datasegs_per_cmd = QLA_TGT_DATASEGS_PER_CMD_24XX;
    tgt->datasegs_per_cont = QLA_TGT_DATASEGS_PER_CONT_24XX;

    mutex_lock(&qla_tgt_mutex);
    list_add_tail(&tgt->tgt_list_entry, &qla_tgt_glist);
    mutex_unlock(&qla_tgt_mutex);

    return 0;
}

/* Must be called under tgt_host_action_mutex */
int qlt_remove_target(struct qla_hw_data *ha, struct scsi_qla_host *vha)
{
    if (!ha->tgt.qla_tgt)
        return 0;

    mutex_lock(&qla_tgt_mutex);
    list_del(&ha->tgt.qla_tgt->tgt_list_entry);
    mutex_unlock(&qla_tgt_mutex);

    ql_dbg(ql_dbg_tgt, vha, 0xe03c, "Unregistering target for host %ld(%p)",
        vha->host_no, ha);
    qlt_release(ha->tgt.qla_tgt);

    return 0;
}

static void qlt_lport_dump(struct scsi_qla_host *vha, u64 wwpn,
    unsigned char *b)
{
    int i;

    pr_debug("qla2xxx HW vha->node_name: ");
    for (i = 0; i < WWN_SIZE; i++)
        pr_debug("%02x ", vha->node_name[i]);
    pr_debug("\n");
    pr_debug("qla2xxx HW vha->port_name: ");
    for (i = 0; i < WWN_SIZE; i++)
        pr_debug("%02x ", vha->port_name[i]);
    pr_debug("\n");

    pr_debug("qla2xxx passed configfs WWPN: ");
    put_unaligned_be64(wwpn, b);
    for (i = 0; i < WWN_SIZE; i++)
        pr_debug("%02x ", b[i]);
    pr_debug("\n");
}

int qlt_lport_register(struct qla_tgt_func_tmpl *qla_tgt_ops, u64 wwpn,
    int (*callback)(struct scsi_qla_host *), void *target_lport_ptr)
{
    struct qla_tgt *tgt;
    struct scsi_qla_host *vha;
    struct qla_hw_data *ha;
    struct Scsi_Host *host;
    unsigned long flags;
    int rc;
    u8 b[WWN_SIZE];

    mutex_lock(&qla_tgt_mutex);
    list_for_each_entry(tgt, &qla_tgt_glist, tgt_list_entry) {
        vha = tgt->vha;
        ha = vha->hw;

        host = vha->host;
        if (!host)
            continue;

        if (ha->tgt.tgt_ops != NULL)
            continue;

        if (!(host->hostt->supported_mode & MODE_TARGET))
            continue;

        spin_lock_irqsave(&ha->hardware_lock, flags);
        if (host->active_mode & MODE_TARGET) {
            pr_debug("MODE_TARGET already active on qla2xxx(%d)\n",
                host->host_no);
            spin_unlock_irqrestore(&ha->hardware_lock, flags);
            continue;
        }
        spin_unlock_irqrestore(&ha->hardware_lock, flags);

        if (!scsi_host_get(host)) {
            ql_dbg(ql_dbg_tgt, vha, 0xe068,
                "Unable to scsi_host_get() for"
                " qla2xxx scsi_host\n");
            continue;
        }
        qlt_lport_dump(vha, wwpn, b);

        if (memcmp(vha->port_name, b, WWN_SIZE)) {
            scsi_host_put(host);
            continue;
        }
        /*
         * Setup passed parameters ahead of invoking callback
         */
        ha->tgt.tgt_ops = qla_tgt_ops;
        ha->tgt.target_lport_ptr = target_lport_ptr;
        rc = (*callback)(vha);
        if (rc != 0) {
            ha->tgt.tgt_ops = NULL;
            ha->tgt.target_lport_ptr = NULL;
        }
        mutex_unlock(&qla_tgt_mutex);
        return rc;
    }
    mutex_unlock(&qla_tgt_mutex);

    return -ENODEV;
}
EXPORT_SYMBOL(qlt_lport_register);

void qlt_lport_deregister(struct scsi_qla_host *vha)
{
    struct qla_hw_data *ha = vha->hw;
    struct Scsi_Host *sh = vha->host;
    /*
     * Clear the target_lport_ptr qla_target_template pointer in qla_hw_data
     */
    ha->tgt.target_lport_ptr = NULL;
    ha->tgt.tgt_ops = NULL;
    /*
     * Release the Scsi_Host reference for the underlying qla2xxx host
     */
    scsi_host_put(sh);
}
EXPORT_SYMBOL(qlt_lport_deregister);

/* Must be called under HW lock */
void qlt_set_mode(struct scsi_qla_host *vha)
{
    struct qla_hw_data *ha = vha->hw;

    switch (ql2x_ini_mode) {
    case QLA2XXX_INI_MODE_DISABLED:
    case QLA2XXX_INI_MODE_EXCLUSIVE:
        vha->host->active_mode = MODE_TARGET;
        break;
    case QLA2XXX_INI_MODE_ENABLED:
        vha->host->active_mode |= MODE_TARGET;
        break;
    default:
        break;
    }

    if (ha->tgt.ini_mode_force_reverse)
        qla_reverse_ini_mode(vha);
}

/* Must be called under HW lock */
void qlt_clear_mode(struct scsi_qla_host *vha)
{
    struct qla_hw_data *ha = vha->hw;

    switch (ql2x_ini_mode) {
    case QLA2XXX_INI_MODE_DISABLED:
        vha->host->active_mode = MODE_UNKNOWN;
        break;
    case QLA2XXX_INI_MODE_EXCLUSIVE:
        vha->host->active_mode = MODE_INITIATOR;
        break;
    case QLA2XXX_INI_MODE_ENABLED:
        vha->host->active_mode &= ~MODE_TARGET;
        break;
    default:
        break;
    }

    if (ha->tgt.ini_mode_force_reverse)
        qla_reverse_ini_mode(vha);
}

/*
 * qla_tgt_enable_vha - NO LOCK HELD
 *
 * host_reset, bring up w/ Target Mode Enabled
 */
void
qlt_enable_vha(struct scsi_qla_host *vha)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    unsigned long flags;

    if (!tgt) {
        ql_dbg(ql_dbg_tgt, vha, 0xe069,
            "Unable to locate qla_tgt pointer from"
            " struct qla_hw_data\n");
        dump_stack();
        return;
    }

    spin_lock_irqsave(&ha->hardware_lock, flags);
    tgt->tgt_stopped = 0;
    qlt_set_mode(vha);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
    qla2xxx_wake_dpc(vha);
    qla2x00_wait_for_hba_online(vha);
}
EXPORT_SYMBOL(qlt_enable_vha);

/*
 * qla_tgt_disable_vha - NO LOCK HELD
 *
 * Disable Target Mode and reset the adapter
 */
void
qlt_disable_vha(struct scsi_qla_host *vha)
{
    struct qla_hw_data *ha = vha->hw;
    struct qla_tgt *tgt = ha->tgt.qla_tgt;
    unsigned long flags;

    if (!tgt) {
        ql_dbg(ql_dbg_tgt, vha, 0xe06a,
            "Unable to locate qla_tgt pointer from"
            " struct qla_hw_data\n");
        dump_stack();
        return;
    }

    spin_lock_irqsave(&ha->hardware_lock, flags);
    qlt_clear_mode(vha);
    spin_unlock_irqrestore(&ha->hardware_lock, flags);

    set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
    qla2xxx_wake_dpc(vha);
    qla2x00_wait_for_hba_online(vha);
}

/*
 * Called from qla_init.c:qla24xx_vport_create() contex to setup
 * the target mode specific struct scsi_qla_host and struct qla_hw_data
 * members.
 */
void
qlt_vport_create(struct scsi_qla_host *vha, struct qla_hw_data *ha)
{
    if (!qla_tgt_mode_enabled(vha))
        return;

    mutex_init(&ha->tgt.tgt_mutex);
    mutex_init(&ha->tgt.tgt_host_action_mutex);

    qlt_clear_mode(vha);

    /*
     * NOTE: Currently the value is kept the same for <24xx and
     * >=24xx ISPs. If it is necessary to change it,
     * the check should be added for specific ISPs,
     * assigning the value appropriately.
     */
    ha->tgt.atio_q_length = ATIO_ENTRY_CNT_24XX;
}

void
qlt_rff_id(struct scsi_qla_host *vha, struct ct_sns_req *ct_req)
{
    /*
     * FC-4 Feature bit 0 indicates target functionality to the name server.
     */
    if (qla_tgt_mode_enabled(vha)) {
        if (qla_ini_mode_enabled(vha))
            ct_req->req.rff_id.fc4_feature = BIT_0 | BIT_1;
        else
            ct_req->req.rff_id.fc4_feature = BIT_0;
    } else if (qla_ini_mode_enabled(vha)) {
        ct_req->req.rff_id.fc4_feature = BIT_1;
    }
}

/*
 * qlt_init_atio_q_entries() - Initializes ATIO queue entries.
 * @ha: HA context
 *
 * Beginning of ATIO ring has initialization control block already built
 * by nvram config routine.
 *
 * Returns 0 on success.
 */
void
qlt_init_atio_q_entries(struct scsi_qla_host *vha)
{
    struct qla_hw_data *ha = vha->hw;
    uint16_t cnt;
    struct atio_from_isp *pkt = (struct atio_from_isp *)ha->tgt.atio_ring;

    if (!qla_tgt_mode_enabled(vha))
        return;

    for (cnt = 0; cnt < ha->tgt.atio_q_length; cnt++) {
        pkt->u.raw.signature = ATIO_PROCESSED;
        pkt++;
    }

}

/*
 * qlt_24xx_process_atio_queue() - Process ATIO queue entries.
 * @ha: SCSI driver HA context
 */
void
qlt_24xx_process_atio_queue(struct scsi_qla_host *vha)
{
    struct qla_hw_data *ha = vha->hw;
    struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;
    struct atio_from_isp *pkt;
    int cnt, i;

    if (!vha->flags.online)
        return;

    while (ha->tgt.atio_ring_ptr->signature != ATIO_PROCESSED) {
        pkt = (struct atio_from_isp *)ha->tgt.atio_ring_ptr;
        cnt = pkt->u.raw.entry_count;

        qlt_24xx_atio_pkt_all_vps(vha, (struct atio_from_isp *)pkt);

        for (i = 0; i < cnt; i++) {
            ha->tgt.atio_ring_index++;
            if (ha->tgt.atio_ring_index == ha->tgt.atio_q_length) {
                ha->tgt.atio_ring_index = 0;
                ha->tgt.atio_ring_ptr = ha->tgt.atio_ring;
            } else
                ha->tgt.atio_ring_ptr++;

            pkt->u.raw.signature = ATIO_PROCESSED;
            pkt = (struct atio_from_isp *)ha->tgt.atio_ring_ptr;
        }
        wmb();
    }

    /* Adjust ring index */
    WRT_REG_DWORD(&reg->atio_q_out, ha->tgt.atio_ring_index);
}

void
qlt_24xx_config_rings(struct scsi_qla_host *vha, device_reg_t __iomem *reg)
{
    struct qla_hw_data *ha = vha->hw;

/* FIXME: atio_q in/out for ha->mqenable=1..? */
    if (ha->mqenable) {
#if 0
        WRT_REG_DWORD(&reg->isp25mq.atio_q_in, 0);
        WRT_REG_DWORD(&reg->isp25mq.atio_q_out, 0);
        RD_REG_DWORD(&reg->isp25mq.atio_q_out);
#endif
    } else {
        /* Setup APTIO registers for target mode */
        WRT_REG_DWORD(&reg->isp24.atio_q_in, 0);
        WRT_REG_DWORD(&reg->isp24.atio_q_out, 0);
        RD_REG_DWORD(&reg->isp24.atio_q_out);
    }
}

void
qlt_24xx_config_nvram_stage1(struct scsi_qla_host *vha, struct nvram_24xx *nv)
{
    struct qla_hw_data *ha = vha->hw;

    if (qla_tgt_mode_enabled(vha)) {
        if (!ha->tgt.saved_set) {
            /* We save only once */
            ha->tgt.saved_exchange_count = nv->exchange_count;
            ha->tgt.saved_firmware_options_1 =
                nv->firmware_options_1;
            ha->tgt.saved_firmware_options_2 =
                nv->firmware_options_2;
            ha->tgt.saved_firmware_options_3 =
                nv->firmware_options_3;
            ha->tgt.saved_set = 1;
        }

        nv->exchange_count = __constant_cpu_to_le16(0xFFFF);

        /* Enable target mode */
        nv->firmware_options_1 |= __constant_cpu_to_le32(BIT_4);

        /* Disable ini mode, if requested */
        if (!qla_ini_mode_enabled(vha))
            nv->firmware_options_1 |= __constant_cpu_to_le32(BIT_5);

        /* Disable Full Login after LIP */
        nv->firmware_options_1 &= __constant_cpu_to_le32(~BIT_13);
        /* Enable initial LIP */
        nv->firmware_options_1 &= __constant_cpu_to_le32(~BIT_9);
        /* Enable FC tapes support */
        nv->firmware_options_2 |= __constant_cpu_to_le32(BIT_12);
        /* Disable Full Login after LIP */
        nv->host_p &= __constant_cpu_to_le32(~BIT_10);
        /* Enable target PRLI control */
        nv->firmware_options_2 |= __constant_cpu_to_le32(BIT_14);
    } else {
        if (ha->tgt.saved_set) {
            nv->exchange_count = ha->tgt.saved_exchange_count;
            nv->firmware_options_1 =
                ha->tgt.saved_firmware_options_1;
            nv->firmware_options_2 =
                ha->tgt.saved_firmware_options_2;
            nv->firmware_options_3 =
                ha->tgt.saved_firmware_options_3;
        }
        return;
    }

    /* out-of-order frames reassembly */
    nv->firmware_options_3 |= BIT_6|BIT_9;

    if (ha->tgt.enable_class_2) {
        if (vha->flags.init_done)
            fc_host_supported_classes(vha->host) =
                FC_COS_CLASS2 | FC_COS_CLASS3;

        nv->firmware_options_2 |= __constant_cpu_to_le32(BIT_8);
    } else {
        if (vha->flags.init_done)
            fc_host_supported_classes(vha->host) = FC_COS_CLASS3;

        nv->firmware_options_2 &= ~__constant_cpu_to_le32(BIT_8);
    }
}

void
qlt_24xx_config_nvram_stage2(struct scsi_qla_host *vha,
    struct init_cb_24xx *icb)
{
    struct qla_hw_data *ha = vha->hw;

    if (ha->tgt.node_name_set) {
        memcpy(icb->node_name, ha->tgt.tgt_node_name, WWN_SIZE);
        icb->firmware_options_1 |= __constant_cpu_to_le32(BIT_14);
    }
}

int
qlt_24xx_process_response_error(struct scsi_qla_host *vha,
    struct sts_entry_24xx *pkt)
{
    switch (pkt->entry_type) {
    case ABTS_RECV_24XX:
    case ABTS_RESP_24XX:
    case CTIO_TYPE7:
    case NOTIFY_ACK_TYPE:
        return 1;
    default:
        return 0;
    }
}

void
qlt_modify_vp_config(struct scsi_qla_host *vha,
    struct vp_config_entry_24xx *vpmod)
{
    if (qla_tgt_mode_enabled(vha))
        vpmod->options_idx1 &= ~BIT_5;
    /* Disable ini mode, if requested */
    if (!qla_ini_mode_enabled(vha))
        vpmod->options_idx1 &= ~BIT_4;
}

void
qlt_probe_one_stage1(struct scsi_qla_host *base_vha, struct qla_hw_data *ha)
{
    if (!QLA_TGT_MODE_ENABLED())
        return;

    mutex_init(&ha->tgt.tgt_mutex);
    mutex_init(&ha->tgt.tgt_host_action_mutex);
    qlt_clear_mode(base_vha);
}

int
qlt_mem_alloc(struct qla_hw_data *ha)
{
    if (!QLA_TGT_MODE_ENABLED())
        return 0;

    ha->tgt.tgt_vp_map = kzalloc(sizeof(struct qla_tgt_vp_map) *
        MAX_MULTI_ID_FABRIC, GFP_KERNEL);
    if (!ha->tgt.tgt_vp_map)
        return -ENOMEM;

    ha->tgt.atio_ring = dma_alloc_coherent(&ha->pdev->dev,
        (ha->tgt.atio_q_length + 1) * sizeof(struct atio_from_isp),
        &ha->tgt.atio_dma, GFP_KERNEL);
    if (!ha->tgt.atio_ring) {
        kfree(ha->tgt.tgt_vp_map);
        return -ENOMEM;
    }
    return 0;
}

void
qlt_mem_free(struct qla_hw_data *ha)
{
    if (!QLA_TGT_MODE_ENABLED())
        return;

    if (ha->tgt.atio_ring) {
        dma_free_coherent(&ha->pdev->dev, (ha->tgt.atio_q_length + 1) *
            sizeof(struct atio_from_isp), ha->tgt.atio_ring,
            ha->tgt.atio_dma);
    }
    kfree(ha->tgt.tgt_vp_map);
}

/* vport_slock to be held by the caller */
void
qlt_update_vp_map(struct scsi_qla_host *vha, int cmd)
{
    if (!QLA_TGT_MODE_ENABLED())
        return;

    switch (cmd) {
    case SET_VP_IDX:
        vha->hw->tgt.tgt_vp_map[vha->vp_idx].vha = vha;
        break;
    case SET_AL_PA:
        vha->hw->tgt.tgt_vp_map[vha->d_id.b.al_pa].idx = vha->vp_idx;
        break;
    case RESET_VP_IDX:
        vha->hw->tgt.tgt_vp_map[vha->vp_idx].vha = NULL;
        break;
    case RESET_AL_PA:
        vha->hw->tgt.tgt_vp_map[vha->d_id.b.al_pa].idx = 0;
        break;
    }
}

static int __init qlt_parse_ini_mode(void)
{
    if (strcasecmp(qlini_mode, QLA2XXX_INI_MODE_STR_EXCLUSIVE) == 0)
        ql2x_ini_mode = QLA2XXX_INI_MODE_EXCLUSIVE;
    else if (strcasecmp(qlini_mode, QLA2XXX_INI_MODE_STR_DISABLED) == 0)
        ql2x_ini_mode = QLA2XXX_INI_MODE_DISABLED;
    else if (strcasecmp(qlini_mode, QLA2XXX_INI_MODE_STR_ENABLED) == 0)
        ql2x_ini_mode = QLA2XXX_INI_MODE_ENABLED;
    else
        return false;

    return true;
}

int __init qlt_init(void)
{
    int ret;

    if (!qlt_parse_ini_mode()) {
        ql_log(ql_log_fatal, NULL, 0xe06b,
            "qlt_parse_ini_mode() failed\n");
        return -EINVAL;
    }

    if (!QLA_TGT_MODE_ENABLED())
        return 0;

    qla_tgt_cmd_cachep = kmem_cache_create("qla_tgt_cmd_cachep",
        sizeof(struct qla_tgt_cmd), __alignof__(struct qla_tgt_cmd), 0,
        NULL);
    if (!qla_tgt_cmd_cachep) {
        ql_log(ql_log_fatal, NULL, 0xe06c,
            "kmem_cache_create for qla_tgt_cmd_cachep failed\n");
        return -ENOMEM;
    }

    qla_tgt_mgmt_cmd_cachep = kmem_cache_create("qla_tgt_mgmt_cmd_cachep",
        sizeof(struct qla_tgt_mgmt_cmd), __alignof__(struct
        qla_tgt_mgmt_cmd), 0, NULL);
    if (!qla_tgt_mgmt_cmd_cachep) {
        ql_log(ql_log_fatal, NULL, 0xe06d,
            "kmem_cache_create for qla_tgt_mgmt_cmd_cachep failed\n");
        ret = -ENOMEM;
        goto out;
    }

    qla_tgt_mgmt_cmd_mempool = mempool_create(25, mempool_alloc_slab,
        mempool_free_slab, qla_tgt_mgmt_cmd_cachep);
    if (!qla_tgt_mgmt_cmd_mempool) {
        ql_log(ql_log_fatal, NULL, 0xe06e,
            "mempool_create for qla_tgt_mgmt_cmd_mempool failed\n");
        ret = -ENOMEM;
        goto out_mgmt_cmd_cachep;
    }

    qla_tgt_wq = alloc_workqueue("qla_tgt_wq", 0, 0);
    if (!qla_tgt_wq) {
        ql_log(ql_log_fatal, NULL, 0xe06f,
            "alloc_workqueue for qla_tgt_wq failed\n");
        ret = -ENOMEM;
        goto out_cmd_mempool;
    }
    /*
     * Return 1 to signal that initiator-mode is being disabled
     */
    return (ql2x_ini_mode == QLA2XXX_INI_MODE_DISABLED) ? 1 : 0;

out_cmd_mempool:
    mempool_destroy(qla_tgt_mgmt_cmd_mempool);
out_mgmt_cmd_cachep:
    kmem_cache_destroy(qla_tgt_mgmt_cmd_cachep);
out:
    kmem_cache_destroy(qla_tgt_cmd_cachep);
    return ret;
}

void qlt_exit(void)
{
    if (!QLA_TGT_MODE_ENABLED())
        return;

    destroy_workqueue(qla_tgt_wq);
    mempool_destroy(qla_tgt_mgmt_cmd_mempool);
    kmem_cache_destroy(qla_tgt_mgmt_cmd_cachep);
    kmem_cache_destroy(qla_tgt_cmd_cachep);
}