bnx2fc_io.c

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/* bnx2fc_io.c: Broadcom NetXtreme II Linux FCoE offload driver.
 * IO manager and SCSI IO processing.
 *
 * Copyright (c) 2008 - 2011 Broadcom Corporation
 *
 * 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.
 *
 * Written by: Bhanu Prakash Gollapudi ([email protected])
 */

#include "bnx2fc.h"

#define RESERVE_FREE_LIST_INDEX num_possible_cpus()

static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
               int bd_index);
static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
                 struct fcoe_fcp_rsp_payload *fcp_rsp,
                 u8 num_rq);

void bnx2fc_cmd_timer_set(struct bnx2fc_cmd *io_req,
              unsigned int timer_msec)
{
    struct bnx2fc_interface *interface = io_req->port->priv;

    if (queue_delayed_work(interface->timer_work_queue,
                   &io_req->timeout_work,
                   msecs_to_jiffies(timer_msec)))
        kref_get(&io_req->refcount);
}

static void bnx2fc_cmd_timeout(struct work_struct *work)
{
    struct bnx2fc_cmd *io_req = container_of(work, struct bnx2fc_cmd,
                         timeout_work.work);
    struct fc_lport *lport;
    struct fc_rport_priv *rdata;
    u8 cmd_type = io_req->cmd_type;
    struct bnx2fc_rport *tgt = io_req->tgt;
    int logo_issued;
    int rc;

    BNX2FC_IO_DBG(io_req, "cmd_timeout, cmd_type = %d,"
              "req_flags = %lx\n", cmd_type, io_req->req_flags);

    spin_lock_bh(&tgt->tgt_lock);
    if (test_and_clear_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags)) {
        clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
        /*
         * ideally we should hold the io_req until RRQ complets,
         * and release io_req from timeout hold.
         */
        spin_unlock_bh(&tgt->tgt_lock);
        bnx2fc_send_rrq(io_req);
        return;
    }
    if (test_and_clear_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags)) {
        BNX2FC_IO_DBG(io_req, "IO ready for reuse now\n");
        goto done;
    }

    switch (cmd_type) {
    case BNX2FC_SCSI_CMD:
        if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
                            &io_req->req_flags)) {
            /* Handle eh_abort timeout */
            BNX2FC_IO_DBG(io_req, "eh_abort timed out\n");
            complete(&io_req->tm_done);
        } else if (test_bit(BNX2FC_FLAG_ISSUE_ABTS,
                    &io_req->req_flags)) {
            /* Handle internally generated ABTS timeout */
            BNX2FC_IO_DBG(io_req, "ABTS timed out refcnt = %d\n",
                    io_req->refcount.refcount.counter);
            if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
                           &io_req->req_flags))) {

                lport = io_req->port->lport;
                rdata = io_req->tgt->rdata;
                logo_issued = test_and_set_bit(
                        BNX2FC_FLAG_EXPL_LOGO,
                        &tgt->flags);
                kref_put(&io_req->refcount, bnx2fc_cmd_release);
                spin_unlock_bh(&tgt->tgt_lock);

                /* Explicitly logo the target */
                if (!logo_issued) {
                    BNX2FC_IO_DBG(io_req, "Explicit "
                           "logo - tgt flags = 0x%lx\n",
                           tgt->flags);

                    mutex_lock(&lport->disc.disc_mutex);
                    lport->tt.rport_logoff(rdata);
                    mutex_unlock(&lport->disc.disc_mutex);
                }
                return;
            }
        } else {
            /* Hanlde IO timeout */
            BNX2FC_IO_DBG(io_req, "IO timed out. issue ABTS\n");
            if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL,
                         &io_req->req_flags)) {
                BNX2FC_IO_DBG(io_req, "IO completed before "
                               " timer expiry\n");
                goto done;
            }

            if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
                          &io_req->req_flags)) {
                rc = bnx2fc_initiate_abts(io_req);
                if (rc == SUCCESS)
                    goto done;
                /*
                 * Explicitly logo the target if
                 * abts initiation fails
                 */
                lport = io_req->port->lport;
                rdata = io_req->tgt->rdata;
                logo_issued = test_and_set_bit(
                        BNX2FC_FLAG_EXPL_LOGO,
                        &tgt->flags);
                kref_put(&io_req->refcount, bnx2fc_cmd_release);
                spin_unlock_bh(&tgt->tgt_lock);

                if (!logo_issued) {
                    BNX2FC_IO_DBG(io_req, "Explicit "
                           "logo - tgt flags = 0x%lx\n",
                           tgt->flags);


                    mutex_lock(&lport->disc.disc_mutex);
                    lport->tt.rport_logoff(rdata);
                    mutex_unlock(&lport->disc.disc_mutex);
                }
                return;
            } else {
                BNX2FC_IO_DBG(io_req, "IO already in "
                              "ABTS processing\n");
            }
        }
        break;
    case BNX2FC_ELS:

        if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
            BNX2FC_IO_DBG(io_req, "ABTS for ELS timed out\n");

            if (!test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
                          &io_req->req_flags)) {
                lport = io_req->port->lport;
                rdata = io_req->tgt->rdata;
                logo_issued = test_and_set_bit(
                        BNX2FC_FLAG_EXPL_LOGO,
                        &tgt->flags);
                kref_put(&io_req->refcount, bnx2fc_cmd_release);
                spin_unlock_bh(&tgt->tgt_lock);

                /* Explicitly logo the target */
                if (!logo_issued) {
                    BNX2FC_IO_DBG(io_req, "Explicitly logo"
                           "(els)\n");
                    mutex_lock(&lport->disc.disc_mutex);
                    lport->tt.rport_logoff(rdata);
                    mutex_unlock(&lport->disc.disc_mutex);
                }
                return;
            }
        } else {
            /*
             * Handle ELS timeout.
             * tgt_lock is used to sync compl path and timeout
             * path. If els compl path is processing this IO, we
             * have nothing to do here, just release the timer hold
             */
            BNX2FC_IO_DBG(io_req, "ELS timed out\n");
            if (test_and_set_bit(BNX2FC_FLAG_ELS_DONE,
                           &io_req->req_flags))
                goto done;

            /* Indicate the cb_func that this ELS is timed out */
            set_bit(BNX2FC_FLAG_ELS_TIMEOUT, &io_req->req_flags);

            if ((io_req->cb_func) && (io_req->cb_arg)) {
                io_req->cb_func(io_req->cb_arg);
                io_req->cb_arg = NULL;
            }
        }
        break;
    default:
        printk(KERN_ERR PFX "cmd_timeout: invalid cmd_type %d\n",
            cmd_type);
        break;
    }

done:
    /* release the cmd that was held when timer was set */
    kref_put(&io_req->refcount, bnx2fc_cmd_release);
    spin_unlock_bh(&tgt->tgt_lock);
}

static void bnx2fc_scsi_done(struct bnx2fc_cmd *io_req, int err_code)
{
    /* Called with host lock held */
    struct scsi_cmnd *sc_cmd = io_req->sc_cmd;

    /*
     * active_cmd_queue may have other command types as well,
     * and during flush operation,  we want to error back only
     * scsi commands.
     */
    if (io_req->cmd_type != BNX2FC_SCSI_CMD)
        return;

    BNX2FC_IO_DBG(io_req, "scsi_done. err_code = 0x%x\n", err_code);
    if (test_bit(BNX2FC_FLAG_CMD_LOST, &io_req->req_flags)) {
        /* Do not call scsi done for this IO */
        return;
    }

    bnx2fc_unmap_sg_list(io_req);
    io_req->sc_cmd = NULL;
    if (!sc_cmd) {
        printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
                    "IO(0x%x) already cleaned up\n",
               io_req->xid);
        return;
    }
    sc_cmd->result = err_code << 16;

    BNX2FC_IO_DBG(io_req, "sc=%p, result=0x%x, retries=%d, allowed=%d\n",
        sc_cmd, host_byte(sc_cmd->result), sc_cmd->retries,
        sc_cmd->allowed);
    scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
    sc_cmd->SCp.ptr = NULL;
    sc_cmd->scsi_done(sc_cmd);
}

struct bnx2fc_cmd_mgr *bnx2fc_cmd_mgr_alloc(struct bnx2fc_hba *hba,
                        u16 min_xid, u16 max_xid)
{
    struct bnx2fc_cmd_mgr *cmgr;
    struct io_bdt *bdt_info;
    struct bnx2fc_cmd *io_req;
    size_t len;
    u32 mem_size;
    u16 xid;
    int i;
    int num_ios, num_pri_ios;
    size_t bd_tbl_sz;
    int arr_sz = num_possible_cpus() + 1;

    if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
        printk(KERN_ERR PFX "cmd_mgr_alloc: Invalid min_xid 0x%x \
                    and max_xid 0x%x\n", min_xid, max_xid);
        return NULL;
    }
    BNX2FC_MISC_DBG("min xid 0x%x, max xid 0x%x\n", min_xid, max_xid);

    num_ios = max_xid - min_xid + 1;
    len = (num_ios * (sizeof(struct bnx2fc_cmd *)));
    len += sizeof(struct bnx2fc_cmd_mgr);

    cmgr = kzalloc(len, GFP_KERNEL);
    if (!cmgr) {
        printk(KERN_ERR PFX "failed to alloc cmgr\n");
        return NULL;
    }

    cmgr->free_list = kzalloc(sizeof(*cmgr->free_list) *
                  arr_sz, GFP_KERNEL);
    if (!cmgr->free_list) {
        printk(KERN_ERR PFX "failed to alloc free_list\n");
        goto mem_err;
    }

    cmgr->free_list_lock = kzalloc(sizeof(*cmgr->free_list_lock) *
                       arr_sz, GFP_KERNEL);
    if (!cmgr->free_list_lock) {
        printk(KERN_ERR PFX "failed to alloc free_list_lock\n");
        goto mem_err;
    }

    cmgr->hba = hba;
    cmgr->cmds = (struct bnx2fc_cmd **)(cmgr + 1);

    for (i = 0; i < arr_sz; i++)  {
        INIT_LIST_HEAD(&cmgr->free_list[i]);
        spin_lock_init(&cmgr->free_list_lock[i]);
    }

    /*
     * Pre-allocated pool of bnx2fc_cmds.
     * Last entry in the free list array is the free list
     * of slow path requests.
     */
    xid = BNX2FC_MIN_XID;
    num_pri_ios = num_ios - BNX2FC_ELSTM_XIDS;
    for (i = 0; i < num_ios; i++) {
        io_req = kzalloc(sizeof(*io_req), GFP_KERNEL);

        if (!io_req) {
            printk(KERN_ERR PFX "failed to alloc io_req\n");
            goto mem_err;
        }

        INIT_LIST_HEAD(&io_req->link);
        INIT_DELAYED_WORK(&io_req->timeout_work, bnx2fc_cmd_timeout);

        io_req->xid = xid++;
        if (i < num_pri_ios)
            list_add_tail(&io_req->link,
                &cmgr->free_list[io_req->xid %
                         num_possible_cpus()]);
        else
            list_add_tail(&io_req->link,
                &cmgr->free_list[num_possible_cpus()]);
        io_req++;
    }

    /* Allocate pool of io_bdts - one for each bnx2fc_cmd */
    mem_size = num_ios * sizeof(struct io_bdt *);
    cmgr->io_bdt_pool = kmalloc(mem_size, GFP_KERNEL);
    if (!cmgr->io_bdt_pool) {
        printk(KERN_ERR PFX "failed to alloc io_bdt_pool\n");
        goto mem_err;
    }

    mem_size = sizeof(struct io_bdt);
    for (i = 0; i < num_ios; i++) {
        cmgr->io_bdt_pool[i] = kmalloc(mem_size, GFP_KERNEL);
        if (!cmgr->io_bdt_pool[i]) {
            printk(KERN_ERR PFX "failed to alloc "
                "io_bdt_pool[%d]\n", i);
            goto mem_err;
        }
    }

    /* Allocate an map fcoe_bdt_ctx structures */
    bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
    for (i = 0; i < num_ios; i++) {
        bdt_info = cmgr->io_bdt_pool[i];
        bdt_info->bd_tbl = dma_alloc_coherent(&hba->pcidev->dev,
                              bd_tbl_sz,
                              &bdt_info->bd_tbl_dma,
                              GFP_KERNEL);
        if (!bdt_info->bd_tbl) {
            printk(KERN_ERR PFX "failed to alloc "
                "bdt_tbl[%d]\n", i);
            goto mem_err;
        }
    }

    return cmgr;

mem_err:
    bnx2fc_cmd_mgr_free(cmgr);
    return NULL;
}

void bnx2fc_cmd_mgr_free(struct bnx2fc_cmd_mgr *cmgr)
{
    struct io_bdt *bdt_info;
    struct bnx2fc_hba *hba = cmgr->hba;
    size_t bd_tbl_sz;
    u16 min_xid = BNX2FC_MIN_XID;
    u16 max_xid = BNX2FC_MAX_XID;
    int num_ios;
    int i;

    num_ios = max_xid - min_xid + 1;

    /* Free fcoe_bdt_ctx structures */
    if (!cmgr->io_bdt_pool)
        goto free_cmd_pool;

    bd_tbl_sz = BNX2FC_MAX_BDS_PER_CMD * sizeof(struct fcoe_bd_ctx);
    for (i = 0; i < num_ios; i++) {
        bdt_info = cmgr->io_bdt_pool[i];
        if (bdt_info->bd_tbl) {
            dma_free_coherent(&hba->pcidev->dev, bd_tbl_sz,
                        bdt_info->bd_tbl,
                        bdt_info->bd_tbl_dma);
            bdt_info->bd_tbl = NULL;
        }
    }

    /* Destroy io_bdt pool */
    for (i = 0; i < num_ios; i++) {
        kfree(cmgr->io_bdt_pool[i]);
        cmgr->io_bdt_pool[i] = NULL;
    }

    kfree(cmgr->io_bdt_pool);
    cmgr->io_bdt_pool = NULL;

free_cmd_pool:
    kfree(cmgr->free_list_lock);

    /* Destroy cmd pool */
    if (!cmgr->free_list)
        goto free_cmgr;

    for (i = 0; i < num_possible_cpus() + 1; i++)  {
        struct bnx2fc_cmd *tmp, *io_req;

        list_for_each_entry_safe(io_req, tmp,
                     &cmgr->free_list[i], link) {
            list_del(&io_req->link);
            kfree(io_req);
        }
    }
    kfree(cmgr->free_list);
free_cmgr:
    /* Free command manager itself */
    kfree(cmgr);
}

struct bnx2fc_cmd *bnx2fc_elstm_alloc(struct bnx2fc_rport *tgt, int type)
{
    struct fcoe_port *port = tgt->port;
    struct bnx2fc_interface *interface = port->priv;
    struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
    struct bnx2fc_cmd *io_req;
    struct list_head *listp;
    struct io_bdt *bd_tbl;
    int index = RESERVE_FREE_LIST_INDEX;
    u32 free_sqes;
    u32 max_sqes;
    u16 xid;

    max_sqes = tgt->max_sqes;
    switch (type) {
    case BNX2FC_TASK_MGMT_CMD:
        max_sqes = BNX2FC_TM_MAX_SQES;
        break;
    case BNX2FC_ELS:
        max_sqes = BNX2FC_ELS_MAX_SQES;
        break;
    default:
        break;
    }

    /*
     * NOTE: Free list insertions and deletions are protected with
     * cmgr lock
     */
    spin_lock_bh(&cmd_mgr->free_list_lock[index]);
    free_sqes = atomic_read(&tgt->free_sqes);
    if ((list_empty(&(cmd_mgr->free_list[index]))) ||
        (tgt->num_active_ios.counter  >= max_sqes) ||
        (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
        BNX2FC_TGT_DBG(tgt, "No free els_tm cmds available "
            "ios(%d):sqes(%d)\n",
            tgt->num_active_ios.counter, tgt->max_sqes);
        if (list_empty(&(cmd_mgr->free_list[index])))
            printk(KERN_ERR PFX "elstm_alloc: list_empty\n");
        spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
        return NULL;
    }

    listp = (struct list_head *)
            cmd_mgr->free_list[index].next;
    list_del_init(listp);
    io_req = (struct bnx2fc_cmd *) listp;
    xid = io_req->xid;
    cmd_mgr->cmds[xid] = io_req;
    atomic_inc(&tgt->num_active_ios);
    atomic_dec(&tgt->free_sqes);
    spin_unlock_bh(&cmd_mgr->free_list_lock[index]);

    INIT_LIST_HEAD(&io_req->link);

    io_req->port = port;
    io_req->cmd_mgr = cmd_mgr;
    io_req->req_flags = 0;
    io_req->cmd_type = type;

    /* Bind io_bdt for this io_req */
    /* Have a static link between io_req and io_bdt_pool */
    bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
    bd_tbl->io_req = io_req;

    /* Hold the io_req  against deletion */
    kref_init(&io_req->refcount);
    return io_req;
}

struct bnx2fc_cmd *bnx2fc_cmd_alloc(struct bnx2fc_rport *tgt)
{
    struct fcoe_port *port = tgt->port;
    struct bnx2fc_interface *interface = port->priv;
    struct bnx2fc_cmd_mgr *cmd_mgr = interface->hba->cmd_mgr;
    struct bnx2fc_cmd *io_req;
    struct list_head *listp;
    struct io_bdt *bd_tbl;
    u32 free_sqes;
    u32 max_sqes;
    u16 xid;
    int index = get_cpu();

    max_sqes = BNX2FC_SCSI_MAX_SQES;
    /*
     * NOTE: Free list insertions and deletions are protected with
     * cmgr lock
     */
    spin_lock_bh(&cmd_mgr->free_list_lock[index]);
    free_sqes = atomic_read(&tgt->free_sqes);
    if ((list_empty(&cmd_mgr->free_list[index])) ||
        (tgt->num_active_ios.counter  >= max_sqes) ||
        (free_sqes + max_sqes <= BNX2FC_SQ_WQES_MAX)) {
        spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
        put_cpu();
        return NULL;
    }

    listp = (struct list_head *)
        cmd_mgr->free_list[index].next;
    list_del_init(listp);
    io_req = (struct bnx2fc_cmd *) listp;
    xid = io_req->xid;
    cmd_mgr->cmds[xid] = io_req;
    atomic_inc(&tgt->num_active_ios);
    atomic_dec(&tgt->free_sqes);
    spin_unlock_bh(&cmd_mgr->free_list_lock[index]);
    put_cpu();

    INIT_LIST_HEAD(&io_req->link);

    io_req->port = port;
    io_req->cmd_mgr = cmd_mgr;
    io_req->req_flags = 0;

    /* Bind io_bdt for this io_req */
    /* Have a static link between io_req and io_bdt_pool */
    bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
    bd_tbl->io_req = io_req;

    /* Hold the io_req  against deletion */
    kref_init(&io_req->refcount);
    return io_req;
}

void bnx2fc_cmd_release(struct kref *ref)
{
    struct bnx2fc_cmd *io_req = container_of(ref,
                        struct bnx2fc_cmd, refcount);
    struct bnx2fc_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
    int index;

    if (io_req->cmd_type == BNX2FC_SCSI_CMD)
        index = io_req->xid % num_possible_cpus();
    else
        index = RESERVE_FREE_LIST_INDEX;


    spin_lock_bh(&cmd_mgr->free_list_lock[index]);
    if (io_req->cmd_type != BNX2FC_SCSI_CMD)
        bnx2fc_free_mp_resc(io_req);
    cmd_mgr->cmds[io_req->xid] = NULL;
    /* Delete IO from retire queue */
    list_del_init(&io_req->link);
    /* Add it to the free list */
    list_add(&io_req->link,
            &cmd_mgr->free_list[index]);
    atomic_dec(&io_req->tgt->num_active_ios);
    spin_unlock_bh(&cmd_mgr->free_list_lock[index]);

}

static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req)
{
    struct bnx2fc_mp_req *mp_req = &(io_req->mp_req);
    struct bnx2fc_interface *interface = io_req->port->priv;
    struct bnx2fc_hba *hba = interface->hba;
    size_t sz = sizeof(struct fcoe_bd_ctx);

    /* clear tm flags */
    mp_req->tm_flags = 0;
    if (mp_req->mp_req_bd) {
        dma_free_coherent(&hba->pcidev->dev, sz,
                     mp_req->mp_req_bd,
                     mp_req->mp_req_bd_dma);
        mp_req->mp_req_bd = NULL;
    }
    if (mp_req->mp_resp_bd) {
        dma_free_coherent(&hba->pcidev->dev, sz,
                     mp_req->mp_resp_bd,
                     mp_req->mp_resp_bd_dma);
        mp_req->mp_resp_bd = NULL;
    }
    if (mp_req->req_buf) {
        dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
                     mp_req->req_buf,
                     mp_req->req_buf_dma);
        mp_req->req_buf = NULL;
    }
    if (mp_req->resp_buf) {
        dma_free_coherent(&hba->pcidev->dev, PAGE_SIZE,
                     mp_req->resp_buf,
                     mp_req->resp_buf_dma);
        mp_req->resp_buf = NULL;
    }
}

int bnx2fc_init_mp_req(struct bnx2fc_cmd *io_req)
{
    struct bnx2fc_mp_req *mp_req;
    struct fcoe_bd_ctx *mp_req_bd;
    struct fcoe_bd_ctx *mp_resp_bd;
    struct bnx2fc_interface *interface = io_req->port->priv;
    struct bnx2fc_hba *hba = interface->hba;
    dma_addr_t addr;
    size_t sz;

    mp_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);
    memset(mp_req, 0, sizeof(struct bnx2fc_mp_req));

    mp_req->req_len = sizeof(struct fcp_cmnd);
    io_req->data_xfer_len = mp_req->req_len;
    mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
                         &mp_req->req_buf_dma,
                         GFP_ATOMIC);
    if (!mp_req->req_buf) {
        printk(KERN_ERR PFX "unable to alloc MP req buffer\n");
        bnx2fc_free_mp_resc(io_req);
        return FAILED;
    }

    mp_req->resp_buf = dma_alloc_coherent(&hba->pcidev->dev, PAGE_SIZE,
                          &mp_req->resp_buf_dma,
                          GFP_ATOMIC);
    if (!mp_req->resp_buf) {
        printk(KERN_ERR PFX "unable to alloc TM resp buffer\n");
        bnx2fc_free_mp_resc(io_req);
        return FAILED;
    }
    memset(mp_req->req_buf, 0, PAGE_SIZE);
    memset(mp_req->resp_buf, 0, PAGE_SIZE);

    /* Allocate and map mp_req_bd and mp_resp_bd */
    sz = sizeof(struct fcoe_bd_ctx);
    mp_req->mp_req_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
                         &mp_req->mp_req_bd_dma,
                         GFP_ATOMIC);
    if (!mp_req->mp_req_bd) {
        printk(KERN_ERR PFX "unable to alloc MP req bd\n");
        bnx2fc_free_mp_resc(io_req);
        return FAILED;
    }
    mp_req->mp_resp_bd = dma_alloc_coherent(&hba->pcidev->dev, sz,
                         &mp_req->mp_resp_bd_dma,
                         GFP_ATOMIC);
    if (!mp_req->mp_req_bd) {
        printk(KERN_ERR PFX "unable to alloc MP resp bd\n");
        bnx2fc_free_mp_resc(io_req);
        return FAILED;
    }
    /* Fill bd table */
    addr = mp_req->req_buf_dma;
    mp_req_bd = mp_req->mp_req_bd;
    mp_req_bd->buf_addr_lo = (u32)addr & 0xffffffff;
    mp_req_bd->buf_addr_hi = (u32)((u64)addr >> 32);
    mp_req_bd->buf_len = PAGE_SIZE;
    mp_req_bd->flags = 0;

    /*
     * MP buffer is either a task mgmt command or an ELS.
     * So the assumption is that it consumes a single bd
     * entry in the bd table
     */
    mp_resp_bd = mp_req->mp_resp_bd;
    addr = mp_req->resp_buf_dma;
    mp_resp_bd->buf_addr_lo = (u32)addr & 0xffffffff;
    mp_resp_bd->buf_addr_hi = (u32)((u64)addr >> 32);
    mp_resp_bd->buf_len = PAGE_SIZE;
    mp_resp_bd->flags = 0;

    return SUCCESS;
}

static int bnx2fc_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
{
    struct fc_lport *lport;
    struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
    struct fc_rport_libfc_priv *rp = rport->dd_data;
    struct fcoe_port *port;
    struct bnx2fc_interface *interface;
    struct bnx2fc_rport *tgt;
    struct bnx2fc_cmd *io_req;
    struct bnx2fc_mp_req *tm_req;
    struct fcoe_task_ctx_entry *task;
    struct fcoe_task_ctx_entry *task_page;
    struct Scsi_Host *host = sc_cmd->device->host;
    struct fc_frame_header *fc_hdr;
    struct fcp_cmnd *fcp_cmnd;
    int task_idx, index;
    int rc = SUCCESS;
    u16 xid;
    u32 sid, did;
    unsigned long start = jiffies;

    lport = shost_priv(host);
    port = lport_priv(lport);
    interface = port->priv;

    if (rport == NULL) {
        printk(KERN_ERR PFX "device_reset: rport is NULL\n");
        rc = FAILED;
        goto tmf_err;
    }

    rc = fc_block_scsi_eh(sc_cmd);
    if (rc)
        return rc;

    if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
        printk(KERN_ERR PFX "device_reset: link is not ready\n");
        rc = FAILED;
        goto tmf_err;
    }
    /* rport and tgt are allocated together, so tgt should be non-NULL */
    tgt = (struct bnx2fc_rport *)&rp[1];

    if (!(test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags))) {
        printk(KERN_ERR PFX "device_reset: tgt not offloaded\n");
        rc = FAILED;
        goto tmf_err;
    }
retry_tmf:
    io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_TASK_MGMT_CMD);
    if (!io_req) {
        if (time_after(jiffies, start + HZ)) {
            printk(KERN_ERR PFX "tmf: Failed TMF");
            rc = FAILED;
            goto tmf_err;
        }
        msleep(20);
        goto retry_tmf;
    }
    /* Initialize rest of io_req fields */
    io_req->sc_cmd = sc_cmd;
    io_req->port = port;
    io_req->tgt = tgt;

    tm_req = (struct bnx2fc_mp_req *)&(io_req->mp_req);

    rc = bnx2fc_init_mp_req(io_req);
    if (rc == FAILED) {
        printk(KERN_ERR PFX "Task mgmt MP request init failed\n");
        spin_lock_bh(&tgt->tgt_lock);
        kref_put(&io_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        goto tmf_err;
    }

    /* Set TM flags */
    io_req->io_req_flags = 0;
    tm_req->tm_flags = tm_flags;

    /* Fill FCP_CMND */
    bnx2fc_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
    fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
    memset(fcp_cmnd->fc_cdb, 0,  sc_cmd->cmd_len);
    fcp_cmnd->fc_dl = 0;

    /* Fill FC header */
    fc_hdr = &(tm_req->req_fc_hdr);
    sid = tgt->sid;
    did = rport->port_id;
    __fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, did, sid,
               FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
               FC_FC_SEQ_INIT, 0);
    /* Obtain exchange id */
    xid = io_req->xid;

    BNX2FC_TGT_DBG(tgt, "Initiate TMF - xid = 0x%x\n", xid);
    task_idx = xid/BNX2FC_TASKS_PER_PAGE;
    index = xid % BNX2FC_TASKS_PER_PAGE;

    /* Initialize task context for this IO request */
    task_page = (struct fcoe_task_ctx_entry *)
            interface->hba->task_ctx[task_idx];
    task = &(task_page[index]);
    bnx2fc_init_mp_task(io_req, task);

    sc_cmd->SCp.ptr = (char *)io_req;

    /* Obtain free SQ entry */
    spin_lock_bh(&tgt->tgt_lock);
    bnx2fc_add_2_sq(tgt, xid);

    /* Enqueue the io_req to active_tm_queue */
    io_req->on_tmf_queue = 1;
    list_add_tail(&io_req->link, &tgt->active_tm_queue);

    init_completion(&io_req->tm_done);
    io_req->wait_for_comp = 1;

    /* Ring doorbell */
    bnx2fc_ring_doorbell(tgt);
    spin_unlock_bh(&tgt->tgt_lock);

    rc = wait_for_completion_timeout(&io_req->tm_done,
                     BNX2FC_TM_TIMEOUT * HZ);
    spin_lock_bh(&tgt->tgt_lock);

    io_req->wait_for_comp = 0;
    if (!(test_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags))) {
        set_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags);
        if (io_req->on_tmf_queue) {
            list_del_init(&io_req->link);
            io_req->on_tmf_queue = 0;
        }
        io_req->wait_for_comp = 1;
        bnx2fc_initiate_cleanup(io_req);
        spin_unlock_bh(&tgt->tgt_lock);
        rc = wait_for_completion_timeout(&io_req->tm_done,
                         BNX2FC_FW_TIMEOUT);
        spin_lock_bh(&tgt->tgt_lock);
        io_req->wait_for_comp = 0;
        if (!rc)
            kref_put(&io_req->refcount, bnx2fc_cmd_release);
    }

    spin_unlock_bh(&tgt->tgt_lock);

    if (!rc) {
        BNX2FC_TGT_DBG(tgt, "task mgmt command failed...\n");
        rc = FAILED;
    } else {
        BNX2FC_TGT_DBG(tgt, "task mgmt command success...\n");
        rc = SUCCESS;
    }
tmf_err:
    return rc;
}

int bnx2fc_initiate_abts(struct bnx2fc_cmd *io_req)
{
    struct fc_lport *lport;
    struct bnx2fc_rport *tgt = io_req->tgt;
    struct fc_rport *rport = tgt->rport;
    struct fc_rport_priv *rdata = tgt->rdata;
    struct bnx2fc_interface *interface;
    struct fcoe_port *port;
    struct bnx2fc_cmd *abts_io_req;
    struct fcoe_task_ctx_entry *task;
    struct fcoe_task_ctx_entry *task_page;
    struct fc_frame_header *fc_hdr;
    struct bnx2fc_mp_req *abts_req;
    int task_idx, index;
    u32 sid, did;
    u16 xid;
    int rc = SUCCESS;
    u32 r_a_tov = rdata->r_a_tov;

    /* called with tgt_lock held */
    BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_abts\n");

    port = io_req->port;
    interface = port->priv;
    lport = port->lport;

    if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
        printk(KERN_ERR PFX "initiate_abts: tgt not offloaded\n");
        rc = FAILED;
        goto abts_err;
    }

    if (rport == NULL) {
        printk(KERN_ERR PFX "initiate_abts: rport is NULL\n");
        rc = FAILED;
        goto abts_err;
    }

    if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
        printk(KERN_ERR PFX "initiate_abts: link is not ready\n");
        rc = FAILED;
        goto abts_err;
    }

    abts_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_ABTS);
    if (!abts_io_req) {
        printk(KERN_ERR PFX "abts: couldnt allocate cmd\n");
        rc = FAILED;
        goto abts_err;
    }

    /* Initialize rest of io_req fields */
    abts_io_req->sc_cmd = NULL;
    abts_io_req->port = port;
    abts_io_req->tgt = tgt;
    abts_io_req->data_xfer_len = 0; /* No data transfer for ABTS */

    abts_req = (struct bnx2fc_mp_req *)&(abts_io_req->mp_req);
    memset(abts_req, 0, sizeof(struct bnx2fc_mp_req));

    /* Fill FC header */
    fc_hdr = &(abts_req->req_fc_hdr);

    /* Obtain oxid and rxid for the original exchange to be aborted */
    fc_hdr->fh_ox_id = htons(io_req->xid);
    fc_hdr->fh_rx_id = htons(io_req->task->rxwr_txrd.var_ctx.rx_id);

    sid = tgt->sid;
    did = rport->port_id;

    __fc_fill_fc_hdr(fc_hdr, FC_RCTL_BA_ABTS, did, sid,
               FC_TYPE_BLS, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
               FC_FC_SEQ_INIT, 0);

    xid = abts_io_req->xid;
    BNX2FC_IO_DBG(abts_io_req, "ABTS io_req\n");
    task_idx = xid/BNX2FC_TASKS_PER_PAGE;
    index = xid % BNX2FC_TASKS_PER_PAGE;

    /* Initialize task context for this IO request */
    task_page = (struct fcoe_task_ctx_entry *)
            interface->hba->task_ctx[task_idx];
    task = &(task_page[index]);
    bnx2fc_init_mp_task(abts_io_req, task);

    /*
     * ABTS task is a temporary task that will be cleaned up
     * irrespective of ABTS response. We need to start the timer
     * for the original exchange, as the CQE is posted for the original
     * IO request.
     *
     * Timer for ABTS is started only when it is originated by a
     * TM request. For the ABTS issued as part of ULP timeout,
     * scsi-ml maintains the timers.
     */

    /* if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))*/
    bnx2fc_cmd_timer_set(io_req, 2 * r_a_tov);

    /* Obtain free SQ entry */
    bnx2fc_add_2_sq(tgt, xid);

    /* Ring doorbell */
    bnx2fc_ring_doorbell(tgt);

abts_err:
    return rc;
}

int bnx2fc_initiate_seq_cleanup(struct bnx2fc_cmd *orig_io_req, u32 offset,
                enum fc_rctl r_ctl)
{
    struct fc_lport *lport;
    struct bnx2fc_rport *tgt = orig_io_req->tgt;
    struct bnx2fc_interface *interface;
    struct fcoe_port *port;
    struct bnx2fc_cmd *seq_clnp_req;
    struct fcoe_task_ctx_entry *task;
    struct fcoe_task_ctx_entry *task_page;
    struct bnx2fc_els_cb_arg *cb_arg = NULL;
    int task_idx, index;
    u16 xid;
    int rc = 0;

    BNX2FC_IO_DBG(orig_io_req, "bnx2fc_initiate_seq_cleanup xid = 0x%x\n",
           orig_io_req->xid);
    kref_get(&orig_io_req->refcount);

    port = orig_io_req->port;
    interface = port->priv;
    lport = port->lport;

    cb_arg = kzalloc(sizeof(struct bnx2fc_els_cb_arg), GFP_ATOMIC);
    if (!cb_arg) {
        printk(KERN_ERR PFX "Unable to alloc cb_arg for seq clnup\n");
        rc = -ENOMEM;
        goto cleanup_err;
    }

    seq_clnp_req = bnx2fc_elstm_alloc(tgt, BNX2FC_SEQ_CLEANUP);
    if (!seq_clnp_req) {
        printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
        rc = -ENOMEM;
        kfree(cb_arg);
        goto cleanup_err;
    }
    /* Initialize rest of io_req fields */
    seq_clnp_req->sc_cmd = NULL;
    seq_clnp_req->port = port;
    seq_clnp_req->tgt = tgt;
    seq_clnp_req->data_xfer_len = 0; /* No data transfer for cleanup */

    xid = seq_clnp_req->xid;

    task_idx = xid/BNX2FC_TASKS_PER_PAGE;
    index = xid % BNX2FC_TASKS_PER_PAGE;

    /* Initialize task context for this IO request */
    task_page = (struct fcoe_task_ctx_entry *)
             interface->hba->task_ctx[task_idx];
    task = &(task_page[index]);
    cb_arg->aborted_io_req = orig_io_req;
    cb_arg->io_req = seq_clnp_req;
    cb_arg->r_ctl = r_ctl;
    cb_arg->offset = offset;
    seq_clnp_req->cb_arg = cb_arg;

    printk(KERN_ERR PFX "call init_seq_cleanup_task\n");
    bnx2fc_init_seq_cleanup_task(seq_clnp_req, task, orig_io_req, offset);

    /* Obtain free SQ entry */
    bnx2fc_add_2_sq(tgt, xid);

    /* Ring doorbell */
    bnx2fc_ring_doorbell(tgt);
cleanup_err:
    return rc;
}

int bnx2fc_initiate_cleanup(struct bnx2fc_cmd *io_req)
{
    struct fc_lport *lport;
    struct bnx2fc_rport *tgt = io_req->tgt;
    struct bnx2fc_interface *interface;
    struct fcoe_port *port;
    struct bnx2fc_cmd *cleanup_io_req;
    struct fcoe_task_ctx_entry *task;
    struct fcoe_task_ctx_entry *task_page;
    int task_idx, index;
    u16 xid, orig_xid;
    int rc = 0;

    /* ASSUMPTION: called with tgt_lock held */
    BNX2FC_IO_DBG(io_req, "Entered bnx2fc_initiate_cleanup\n");

    port = io_req->port;
    interface = port->priv;
    lport = port->lport;

    cleanup_io_req = bnx2fc_elstm_alloc(tgt, BNX2FC_CLEANUP);
    if (!cleanup_io_req) {
        printk(KERN_ERR PFX "cleanup: couldnt allocate cmd\n");
        rc = -1;
        goto cleanup_err;
    }

    /* Initialize rest of io_req fields */
    cleanup_io_req->sc_cmd = NULL;
    cleanup_io_req->port = port;
    cleanup_io_req->tgt = tgt;
    cleanup_io_req->data_xfer_len = 0; /* No data transfer for cleanup */

    xid = cleanup_io_req->xid;

    task_idx = xid/BNX2FC_TASKS_PER_PAGE;
    index = xid % BNX2FC_TASKS_PER_PAGE;

    /* Initialize task context for this IO request */
    task_page = (struct fcoe_task_ctx_entry *)
            interface->hba->task_ctx[task_idx];
    task = &(task_page[index]);
    orig_xid = io_req->xid;

    BNX2FC_IO_DBG(io_req, "CLEANUP io_req xid = 0x%x\n", xid);

    bnx2fc_init_cleanup_task(cleanup_io_req, task, orig_xid);

    /* Obtain free SQ entry */
    bnx2fc_add_2_sq(tgt, xid);

    /* Ring doorbell */
    bnx2fc_ring_doorbell(tgt);

cleanup_err:
    return rc;
}

int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
{
    return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
}

int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
{
    return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
}

int bnx2fc_expl_logo(struct fc_lport *lport, struct bnx2fc_cmd *io_req)
{
    struct bnx2fc_rport *tgt = io_req->tgt;
    struct fc_rport_priv *rdata = tgt->rdata;
    int logo_issued;
    int rc = SUCCESS;
    int wait_cnt = 0;

    BNX2FC_IO_DBG(io_req, "Expl logo - tgt flags = 0x%lx\n",
              tgt->flags);
    logo_issued = test_and_set_bit(BNX2FC_FLAG_EXPL_LOGO,
                       &tgt->flags);
    io_req->wait_for_comp = 1;
    bnx2fc_initiate_cleanup(io_req);

    spin_unlock_bh(&tgt->tgt_lock);

    wait_for_completion(&io_req->tm_done);

    io_req->wait_for_comp = 0;
    /*
     * release the reference taken in eh_abort to allow the
     * target to re-login after flushing IOs
     */
     kref_put(&io_req->refcount, bnx2fc_cmd_release);

    if (!logo_issued) {
        clear_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags);
        mutex_lock(&lport->disc.disc_mutex);
        lport->tt.rport_logoff(rdata);
        mutex_unlock(&lport->disc.disc_mutex);
        do {
            msleep(BNX2FC_RELOGIN_WAIT_TIME);
            if (wait_cnt++ > BNX2FC_RELOGIN_WAIT_CNT) {
                rc = FAILED;
                break;
            }
        } while (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags));
    }
    spin_lock_bh(&tgt->tgt_lock);
    return rc;
}
int bnx2fc_eh_abort(struct scsi_cmnd *sc_cmd)
{
    struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
    struct fc_rport_libfc_priv *rp = rport->dd_data;
    struct bnx2fc_cmd *io_req;
    struct fc_lport *lport;
    struct bnx2fc_rport *tgt;
    int rc = FAILED;


    rc = fc_block_scsi_eh(sc_cmd);
    if (rc)
        return rc;

    lport = shost_priv(sc_cmd->device->host);
    if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
        printk(KERN_ERR PFX "eh_abort: link not ready\n");
        return rc;
    }

    tgt = (struct bnx2fc_rport *)&rp[1];

    BNX2FC_TGT_DBG(tgt, "Entered bnx2fc_eh_abort\n");

    spin_lock_bh(&tgt->tgt_lock);
    io_req = (struct bnx2fc_cmd *)sc_cmd->SCp.ptr;
    if (!io_req) {
        /* Command might have just completed */
        printk(KERN_ERR PFX "eh_abort: io_req is NULL\n");
        spin_unlock_bh(&tgt->tgt_lock);
        return SUCCESS;
    }
    BNX2FC_IO_DBG(io_req, "eh_abort - refcnt = %d\n",
              io_req->refcount.refcount.counter);

    /* Hold IO request across abort processing */
    kref_get(&io_req->refcount);

    BUG_ON(tgt != io_req->tgt);

    /* Remove the io_req from the active_q. */
    /*
     * Task Mgmt functions (LUN RESET & TGT RESET) will not
     * issue an ABTS on this particular IO req, as the
     * io_req is no longer in the active_q.
     */
    if (tgt->flush_in_prog) {
        printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
            "flush in progress\n", io_req->xid);
        kref_put(&io_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        return SUCCESS;
    }

    if (io_req->on_active_queue == 0) {
        printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
                "not on active_q\n", io_req->xid);
        /*
         * This condition can happen only due to the FW bug,
         * where we do not receive cleanup response from
         * the FW. Handle this case gracefully by erroring
         * back the IO request to SCSI-ml
         */
        bnx2fc_scsi_done(io_req, DID_ABORT);

        kref_put(&io_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        return SUCCESS;
    }

    /*
     * Only eh_abort processing will remove the IO from
     * active_cmd_q before processing the request. this is
     * done to avoid race conditions between IOs aborted
     * as part of task management completion and eh_abort
     * processing
     */
    list_del_init(&io_req->link);
    io_req->on_active_queue = 0;
    /* Move IO req to retire queue */
    list_add_tail(&io_req->link, &tgt->io_retire_queue);

    init_completion(&io_req->tm_done);

    if (test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags)) {
        printk(KERN_ERR PFX "eh_abort: io_req (xid = 0x%x) "
                "already in abts processing\n", io_req->xid);
        if (cancel_delayed_work(&io_req->timeout_work))
            kref_put(&io_req->refcount,
                 bnx2fc_cmd_release); /* drop timer hold */
        rc = bnx2fc_expl_logo(lport, io_req);
        goto out;
    }

    /* Cancel the current timer running on this io_req */
    if (cancel_delayed_work(&io_req->timeout_work))
        kref_put(&io_req->refcount,
             bnx2fc_cmd_release); /* drop timer hold */
    set_bit(BNX2FC_FLAG_EH_ABORT, &io_req->req_flags);
    io_req->wait_for_comp = 1;
    rc = bnx2fc_initiate_abts(io_req);
    if (rc == FAILED) {
        bnx2fc_initiate_cleanup(io_req);
        spin_unlock_bh(&tgt->tgt_lock);
        wait_for_completion(&io_req->tm_done);
        spin_lock_bh(&tgt->tgt_lock);
        io_req->wait_for_comp = 0;
        goto done;
    }
    spin_unlock_bh(&tgt->tgt_lock);

    wait_for_completion(&io_req->tm_done);

    spin_lock_bh(&tgt->tgt_lock);
    io_req->wait_for_comp = 0;
    if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
                    &io_req->req_flags))) {
        /* Let the scsi-ml try to recover this command */
        printk(KERN_ERR PFX "abort failed, xid = 0x%x\n",
               io_req->xid);
        rc = bnx2fc_expl_logo(lport, io_req);
        goto out;
    } else {
        /*
         * We come here even when there was a race condition
         * between timeout and abts completion, and abts
         * completion happens just in time.
         */
        BNX2FC_IO_DBG(io_req, "abort succeeded\n");
        rc = SUCCESS;
        bnx2fc_scsi_done(io_req, DID_ABORT);
        kref_put(&io_req->refcount, bnx2fc_cmd_release);
    }
done:
    /* release the reference taken in eh_abort */
    kref_put(&io_req->refcount, bnx2fc_cmd_release);
out:
    spin_unlock_bh(&tgt->tgt_lock);
    return rc;
}

void bnx2fc_process_seq_cleanup_compl(struct bnx2fc_cmd *seq_clnp_req,
                      struct fcoe_task_ctx_entry *task,
                      u8 rx_state)
{
    struct bnx2fc_els_cb_arg *cb_arg = seq_clnp_req->cb_arg;
    struct bnx2fc_cmd *orig_io_req = cb_arg->aborted_io_req;
    u32 offset = cb_arg->offset;
    enum fc_rctl r_ctl = cb_arg->r_ctl;
    int rc = 0;
    struct bnx2fc_rport *tgt = orig_io_req->tgt;

    BNX2FC_IO_DBG(orig_io_req, "Entered process_cleanup_compl xid = 0x%x"
                  "cmd_type = %d\n",
           seq_clnp_req->xid, seq_clnp_req->cmd_type);

    if (rx_state == FCOE_TASK_RX_STATE_IGNORED_SEQUENCE_CLEANUP) {
        printk(KERN_ERR PFX "seq cleanup ignored - xid = 0x%x\n",
            seq_clnp_req->xid);
        goto free_cb_arg;
    }

    spin_unlock_bh(&tgt->tgt_lock);
    rc = bnx2fc_send_srr(orig_io_req, offset, r_ctl);
    spin_lock_bh(&tgt->tgt_lock);

    if (rc)
        printk(KERN_ERR PFX "clnup_compl: Unable to send SRR"
            " IO will abort\n");
    seq_clnp_req->cb_arg = NULL;
    kref_put(&orig_io_req->refcount, bnx2fc_cmd_release);
free_cb_arg:
    kfree(cb_arg);
    return;
}

void bnx2fc_process_cleanup_compl(struct bnx2fc_cmd *io_req,
                  struct fcoe_task_ctx_entry *task,
                  u8 num_rq)
{
    BNX2FC_IO_DBG(io_req, "Entered process_cleanup_compl "
                  "refcnt = %d, cmd_type = %d\n",
           io_req->refcount.refcount.counter, io_req->cmd_type);
    bnx2fc_scsi_done(io_req, DID_ERROR);
    kref_put(&io_req->refcount, bnx2fc_cmd_release);
    if (io_req->wait_for_comp)
        complete(&io_req->tm_done);
}

void bnx2fc_process_abts_compl(struct bnx2fc_cmd *io_req,
                   struct fcoe_task_ctx_entry *task,
                   u8 num_rq)
{
    u32 r_ctl;
    u32 r_a_tov = FC_DEF_R_A_TOV;
    u8 issue_rrq = 0;
    struct bnx2fc_rport *tgt = io_req->tgt;

    BNX2FC_IO_DBG(io_req, "Entered process_abts_compl xid = 0x%x"
                  "refcnt = %d, cmd_type = %d\n",
           io_req->xid,
           io_req->refcount.refcount.counter, io_req->cmd_type);

    if (test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
                       &io_req->req_flags)) {
        BNX2FC_IO_DBG(io_req, "Timer context finished processing"
                " this io\n");
        return;
    }

    /* Do not issue RRQ as this IO is already cleanedup */
    if (test_and_set_bit(BNX2FC_FLAG_IO_CLEANUP,
                &io_req->req_flags))
        goto io_compl;

    /*
     * For ABTS issued due to SCSI eh_abort_handler, timeout
     * values are maintained by scsi-ml itself. Cancel timeout
     * in case ABTS issued as part of task management function
     * or due to FW error.
     */
    if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags))
        if (cancel_delayed_work(&io_req->timeout_work))
            kref_put(&io_req->refcount,
                 bnx2fc_cmd_release); /* drop timer hold */

    r_ctl = (u8)task->rxwr_only.union_ctx.comp_info.abts_rsp.r_ctl;

    switch (r_ctl) {
    case FC_RCTL_BA_ACC:
        /*
         * Dont release this cmd yet. It will be relesed
         * after we get RRQ response
         */
        BNX2FC_IO_DBG(io_req, "ABTS response - ACC Send RRQ\n");
        issue_rrq = 1;
        break;

    case FC_RCTL_BA_RJT:
        BNX2FC_IO_DBG(io_req, "ABTS response - RJT\n");
        break;
    default:
        printk(KERN_ERR PFX "Unknown ABTS response\n");
        break;
    }

    if (issue_rrq) {
        BNX2FC_IO_DBG(io_req, "Issue RRQ after R_A_TOV\n");
        set_bit(BNX2FC_FLAG_ISSUE_RRQ, &io_req->req_flags);
    }
    set_bit(BNX2FC_FLAG_RETIRE_OXID, &io_req->req_flags);
    bnx2fc_cmd_timer_set(io_req, r_a_tov);

io_compl:
    if (io_req->wait_for_comp) {
        if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
                       &io_req->req_flags))
            complete(&io_req->tm_done);
    } else {
        /*
         * We end up here when ABTS is issued as
         * in asynchronous context, i.e., as part
         * of task management completion, or
         * when FW error is received or when the
         * ABTS is issued when the IO is timed
         * out.
         */

        if (io_req->on_active_queue) {
            list_del_init(&io_req->link);
            io_req->on_active_queue = 0;
            /* Move IO req to retire queue */
            list_add_tail(&io_req->link, &tgt->io_retire_queue);
        }
        bnx2fc_scsi_done(io_req, DID_ERROR);
        kref_put(&io_req->refcount, bnx2fc_cmd_release);
    }
}

static void bnx2fc_lun_reset_cmpl(struct bnx2fc_cmd *io_req)
{
    struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
    struct bnx2fc_rport *tgt = io_req->tgt;
    struct bnx2fc_cmd *cmd, *tmp;
    int tm_lun = sc_cmd->device->lun;
    int rc = 0;
    int lun;

    /* called with tgt_lock held */
    BNX2FC_IO_DBG(io_req, "Entered bnx2fc_lun_reset_cmpl\n");
    /*
     * Walk thru the active_ios queue and ABORT the IO
     * that matches with the LUN that was reset
     */
    list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
        BNX2FC_TGT_DBG(tgt, "LUN RST cmpl: scan for pending IOs\n");
        lun = cmd->sc_cmd->device->lun;
        if (lun == tm_lun) {
            /* Initiate ABTS on this cmd */
            if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
                          &cmd->req_flags)) {
                /* cancel the IO timeout */
                if (cancel_delayed_work(&io_req->timeout_work))
                    kref_put(&io_req->refcount,
                         bnx2fc_cmd_release);
                            /* timer hold */
                rc = bnx2fc_initiate_abts(cmd);
                /* abts shouldn't fail in this context */
                WARN_ON(rc != SUCCESS);
            } else
                printk(KERN_ERR PFX "lun_rst: abts already in"
                    " progress for this IO 0x%x\n",
                    cmd->xid);
        }
    }
}

static void bnx2fc_tgt_reset_cmpl(struct bnx2fc_cmd *io_req)
{
    struct bnx2fc_rport *tgt = io_req->tgt;
    struct bnx2fc_cmd *cmd, *tmp;
    int rc = 0;

    /* called with tgt_lock held */
    BNX2FC_IO_DBG(io_req, "Entered bnx2fc_tgt_reset_cmpl\n");
    /*
     * Walk thru the active_ios queue and ABORT the IO
     * that matches with the LUN that was reset
     */
    list_for_each_entry_safe(cmd, tmp, &tgt->active_cmd_queue, link) {
        BNX2FC_TGT_DBG(tgt, "TGT RST cmpl: scan for pending IOs\n");
        /* Initiate ABTS */
        if (!test_and_set_bit(BNX2FC_FLAG_ISSUE_ABTS,
                            &cmd->req_flags)) {
            /* cancel the IO timeout */
            if (cancel_delayed_work(&io_req->timeout_work))
                kref_put(&io_req->refcount,
                     bnx2fc_cmd_release); /* timer hold */
            rc = bnx2fc_initiate_abts(cmd);
            /* abts shouldn't fail in this context */
            WARN_ON(rc != SUCCESS);

        } else
            printk(KERN_ERR PFX "tgt_rst: abts already in progress"
                " for this IO 0x%x\n", cmd->xid);
    }
}

void bnx2fc_process_tm_compl(struct bnx2fc_cmd *io_req,
                 struct fcoe_task_ctx_entry *task, u8 num_rq)
{
    struct bnx2fc_mp_req *tm_req;
    struct fc_frame_header *fc_hdr;
    struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
    u64 *hdr;
    u64 *temp_hdr;
    void *rsp_buf;

    /* Called with tgt_lock held */
    BNX2FC_IO_DBG(io_req, "Entered process_tm_compl\n");

    if (!(test_bit(BNX2FC_FLAG_TM_TIMEOUT, &io_req->req_flags)))
        set_bit(BNX2FC_FLAG_TM_COMPL, &io_req->req_flags);
    else {
        /* TM has already timed out and we got
         * delayed completion. Ignore completion
         * processing.
         */
        return;
    }

    tm_req = &(io_req->mp_req);
    fc_hdr = &(tm_req->resp_fc_hdr);
    hdr = (u64 *)fc_hdr;
    temp_hdr = (u64 *)
        &task->rxwr_only.union_ctx.comp_info.mp_rsp.fc_hdr;
    hdr[0] = cpu_to_be64(temp_hdr[0]);
    hdr[1] = cpu_to_be64(temp_hdr[1]);
    hdr[2] = cpu_to_be64(temp_hdr[2]);

    tm_req->resp_len =
        task->rxwr_only.union_ctx.comp_info.mp_rsp.mp_payload_len;

    rsp_buf = tm_req->resp_buf;

    if (fc_hdr->fh_r_ctl == FC_RCTL_DD_CMD_STATUS) {
        bnx2fc_parse_fcp_rsp(io_req,
                     (struct fcoe_fcp_rsp_payload *)
                     rsp_buf, num_rq);
        if (io_req->fcp_rsp_code == 0) {
            /* TM successful */
            if (tm_req->tm_flags & FCP_TMF_LUN_RESET)
                bnx2fc_lun_reset_cmpl(io_req);
            else if (tm_req->tm_flags & FCP_TMF_TGT_RESET)
                bnx2fc_tgt_reset_cmpl(io_req);
        }
    } else {
        printk(KERN_ERR PFX "tmf's fc_hdr r_ctl = 0x%x\n",
            fc_hdr->fh_r_ctl);
    }
    if (!sc_cmd->SCp.ptr) {
        printk(KERN_ERR PFX "tm_compl: SCp.ptr is NULL\n");
        return;
    }
    switch (io_req->fcp_status) {
    case FC_GOOD:
        if (io_req->cdb_status == 0) {
            /* Good IO completion */
            sc_cmd->result = DID_OK << 16;
        } else {
            /* Transport status is good, SCSI status not good */
            sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
        }
        if (io_req->fcp_resid)
            scsi_set_resid(sc_cmd, io_req->fcp_resid);
        break;

    default:
        BNX2FC_IO_DBG(io_req, "process_tm_compl: fcp_status = %d\n",
               io_req->fcp_status);
        break;
    }

    sc_cmd = io_req->sc_cmd;
    io_req->sc_cmd = NULL;

    /* check if the io_req exists in tgt's tmf_q */
    if (io_req->on_tmf_queue) {

        list_del_init(&io_req->link);
        io_req->on_tmf_queue = 0;
    } else {

        printk(KERN_ERR PFX "Command not on active_cmd_queue!\n");
        return;
    }

    sc_cmd->SCp.ptr = NULL;
    sc_cmd->scsi_done(sc_cmd);

    kref_put(&io_req->refcount, bnx2fc_cmd_release);
    if (io_req->wait_for_comp) {
        BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
        complete(&io_req->tm_done);
    }
}

static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
               int bd_index)
{
    struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
    int frag_size, sg_frags;

    sg_frags = 0;
    while (sg_len) {
        if (sg_len >= BNX2FC_BD_SPLIT_SZ)
            frag_size = BNX2FC_BD_SPLIT_SZ;
        else
            frag_size = sg_len;
        bd[bd_index + sg_frags].buf_addr_lo = addr & 0xffffffff;
        bd[bd_index + sg_frags].buf_addr_hi  = addr >> 32;
        bd[bd_index + sg_frags].buf_len = (u16)frag_size;
        bd[bd_index + sg_frags].flags = 0;

        addr += (u64) frag_size;
        sg_frags++;
        sg_len -= frag_size;
    }
    return sg_frags;

}

static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
{
    struct bnx2fc_interface *interface = io_req->port->priv;
    struct bnx2fc_hba *hba = interface->hba;
    struct scsi_cmnd *sc = io_req->sc_cmd;
    struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
    struct scatterlist *sg;
    int byte_count = 0;
    int sg_count = 0;
    int bd_count = 0;
    int sg_frags;
    unsigned int sg_len;
    u64 addr;
    int i;

    sg_count = dma_map_sg(&hba->pcidev->dev, scsi_sglist(sc),
                  scsi_sg_count(sc), sc->sc_data_direction);
    scsi_for_each_sg(sc, sg, sg_count, i) {
        sg_len = sg_dma_len(sg);
        addr = sg_dma_address(sg);
        if (sg_len > BNX2FC_MAX_BD_LEN) {
            sg_frags = bnx2fc_split_bd(io_req, addr, sg_len,
                           bd_count);
        } else {

            sg_frags = 1;
            bd[bd_count].buf_addr_lo = addr & 0xffffffff;
            bd[bd_count].buf_addr_hi  = addr >> 32;
            bd[bd_count].buf_len = (u16)sg_len;
            bd[bd_count].flags = 0;
        }
        bd_count += sg_frags;
        byte_count += sg_len;
    }
    if (byte_count != scsi_bufflen(sc))
        printk(KERN_ERR PFX "byte_count = %d != scsi_bufflen = %d, "
            "task_id = 0x%x\n", byte_count, scsi_bufflen(sc),
            io_req->xid);
    return bd_count;
}

static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
{
    struct scsi_cmnd *sc = io_req->sc_cmd;
    struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
    int bd_count;

    if (scsi_sg_count(sc)) {
        bd_count = bnx2fc_map_sg(io_req);
        if (bd_count == 0)
            return -ENOMEM;
    } else {
        bd_count = 0;
        bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
        bd[0].buf_len = bd[0].flags = 0;
    }
    io_req->bd_tbl->bd_valid = bd_count;

    return 0;
}

static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
{
    struct scsi_cmnd *sc = io_req->sc_cmd;

    if (io_req->bd_tbl->bd_valid && sc) {
        scsi_dma_unmap(sc);
        io_req->bd_tbl->bd_valid = 0;
    }
}

void bnx2fc_build_fcp_cmnd(struct bnx2fc_cmd *io_req,
                  struct fcp_cmnd *fcp_cmnd)
{
    struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
    char tag[2];

    memset(fcp_cmnd, 0, sizeof(struct fcp_cmnd));

    int_to_scsilun(sc_cmd->device->lun, &fcp_cmnd->fc_lun);

    fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
    memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);

    fcp_cmnd->fc_cmdref = 0;
    fcp_cmnd->fc_pri_ta = 0;
    fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
    fcp_cmnd->fc_flags = io_req->io_req_flags;

    if (scsi_populate_tag_msg(sc_cmd, tag)) {
        switch (tag[0]) {
        case HEAD_OF_QUEUE_TAG:
            fcp_cmnd->fc_pri_ta = FCP_PTA_HEADQ;
            break;
        case ORDERED_QUEUE_TAG:
            fcp_cmnd->fc_pri_ta = FCP_PTA_ORDERED;
            break;
        default:
            fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
            break;
        }
    } else {
        fcp_cmnd->fc_pri_ta = 0;
    }
}

static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
                 struct fcoe_fcp_rsp_payload *fcp_rsp,
                 u8 num_rq)
{
    struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
    struct bnx2fc_rport *tgt = io_req->tgt;
    u8 rsp_flags = fcp_rsp->fcp_flags.flags;
    u32 rq_buff_len = 0;
    int i;
    unsigned char *rq_data;
    unsigned char *dummy;
    int fcp_sns_len = 0;
    int fcp_rsp_len = 0;

    io_req->fcp_status = FC_GOOD;
    io_req->fcp_resid = fcp_rsp->fcp_resid;

    io_req->scsi_comp_flags = rsp_flags;
    CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
                fcp_rsp->scsi_status_code;

    /* Fetch fcp_rsp_info and fcp_sns_info if available */
    if (num_rq) {

        /*
         * We do not anticipate num_rq >1, as the linux defined
         * SCSI_SENSE_BUFFERSIZE is 96 bytes + 8 bytes of FCP_RSP_INFO
         * 256 bytes of single rq buffer is good enough to hold this.
         */

        if (rsp_flags &
            FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID) {
            fcp_rsp_len = rq_buff_len
                    = fcp_rsp->fcp_rsp_len;
        }

        if (rsp_flags &
            FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID) {
            fcp_sns_len = fcp_rsp->fcp_sns_len;
            rq_buff_len += fcp_rsp->fcp_sns_len;
        }

        io_req->fcp_rsp_len = fcp_rsp_len;
        io_req->fcp_sns_len = fcp_sns_len;

        if (rq_buff_len > num_rq * BNX2FC_RQ_BUF_SZ) {
            /* Invalid sense sense length. */
            printk(KERN_ERR PFX "invalid sns length %d\n",
                rq_buff_len);
            /* reset rq_buff_len */
            rq_buff_len =  num_rq * BNX2FC_RQ_BUF_SZ;
        }

        rq_data = bnx2fc_get_next_rqe(tgt, 1);

        if (num_rq > 1) {
            /* We do not need extra sense data */
            for (i = 1; i < num_rq; i++)
                dummy = bnx2fc_get_next_rqe(tgt, 1);
        }

        /* fetch fcp_rsp_code */
        if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
            /* Only for task management function */
            io_req->fcp_rsp_code = rq_data[3];
            printk(KERN_ERR PFX "fcp_rsp_code = %d\n",
                io_req->fcp_rsp_code);
        }

        /* fetch sense data */
        rq_data += fcp_rsp_len;

        if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
            printk(KERN_ERR PFX "Truncating sense buffer\n");
            fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
        }

        memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
        if (fcp_sns_len)
            memcpy(sc_cmd->sense_buffer, rq_data, fcp_sns_len);

        /* return RQ entries */
        for (i = 0; i < num_rq; i++)
            bnx2fc_return_rqe(tgt, 1);
    }
}

int bnx2fc_queuecommand(struct Scsi_Host *host,
            struct scsi_cmnd *sc_cmd)
{
    struct fc_lport *lport = shost_priv(host);
    struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
    struct fc_rport_libfc_priv *rp = rport->dd_data;
    struct bnx2fc_rport *tgt;
    struct bnx2fc_cmd *io_req;
    int rc = 0;
    int rval;

    rval = fc_remote_port_chkready(rport);
    if (rval) {
        sc_cmd->result = rval;
        sc_cmd->scsi_done(sc_cmd);
        return 0;
    }

    if ((lport->state != LPORT_ST_READY) || !(lport->link_up)) {
        rc = SCSI_MLQUEUE_HOST_BUSY;
        goto exit_qcmd;
    }

    /* rport and tgt are allocated together, so tgt should be non-NULL */
    tgt = (struct bnx2fc_rport *)&rp[1];

    if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
        /*
         * Session is not offloaded yet. Let SCSI-ml retry
         * the command.
         */
        rc = SCSI_MLQUEUE_TARGET_BUSY;
        goto exit_qcmd;
    }

    io_req = bnx2fc_cmd_alloc(tgt);
    if (!io_req) {
        rc = SCSI_MLQUEUE_HOST_BUSY;
        goto exit_qcmd;
    }
    io_req->sc_cmd = sc_cmd;

    if (bnx2fc_post_io_req(tgt, io_req)) {
        printk(KERN_ERR PFX "Unable to post io_req\n");
        rc = SCSI_MLQUEUE_HOST_BUSY;
        goto exit_qcmd;
    }
exit_qcmd:
    return rc;
}

void bnx2fc_process_scsi_cmd_compl(struct bnx2fc_cmd *io_req,
                   struct fcoe_task_ctx_entry *task,
                   u8 num_rq)
{
    struct fcoe_fcp_rsp_payload *fcp_rsp;
    struct bnx2fc_rport *tgt = io_req->tgt;
    struct scsi_cmnd *sc_cmd;
    struct Scsi_Host *host;


    /* scsi_cmd_cmpl is called with tgt lock held */

    if (test_and_set_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
        /* we will not receive ABTS response for this IO */
        BNX2FC_IO_DBG(io_req, "Timer context finished processing "
               "this scsi cmd\n");
    }

    /* Cancel the timeout_work, as we received IO completion */
    if (cancel_delayed_work(&io_req->timeout_work))
        kref_put(&io_req->refcount,
             bnx2fc_cmd_release); /* drop timer hold */

    sc_cmd = io_req->sc_cmd;
    if (sc_cmd == NULL) {
        printk(KERN_ERR PFX "scsi_cmd_compl - sc_cmd is NULL\n");
        return;
    }

    /* Fetch fcp_rsp from task context and perform cmd completion */
    fcp_rsp = (struct fcoe_fcp_rsp_payload *)
           &(task->rxwr_only.union_ctx.comp_info.fcp_rsp.payload);

    /* parse fcp_rsp and obtain sense data from RQ if available */
    bnx2fc_parse_fcp_rsp(io_req, fcp_rsp, num_rq);

    host = sc_cmd->device->host;
    if (!sc_cmd->SCp.ptr) {
        printk(KERN_ERR PFX "SCp.ptr is NULL\n");
        return;
    }

    if (io_req->on_active_queue) {
        list_del_init(&io_req->link);
        io_req->on_active_queue = 0;
        /* Move IO req to retire queue */
        list_add_tail(&io_req->link, &tgt->io_retire_queue);
    } else {
        /* This should not happen, but could have been pulled
         * by bnx2fc_flush_active_ios(), or during a race
         * between command abort and (late) completion.
         */
        BNX2FC_IO_DBG(io_req, "xid not on active_cmd_queue\n");
        if (io_req->wait_for_comp)
            if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
                           &io_req->req_flags))
                complete(&io_req->tm_done);
    }

    bnx2fc_unmap_sg_list(io_req);
    io_req->sc_cmd = NULL;

    switch (io_req->fcp_status) {
    case FC_GOOD:
        if (io_req->cdb_status == 0) {
            /* Good IO completion */
            sc_cmd->result = DID_OK << 16;
        } else {
            /* Transport status is good, SCSI status not good */
            BNX2FC_IO_DBG(io_req, "scsi_cmpl: cdb_status = %d"
                 " fcp_resid = 0x%x\n",
                io_req->cdb_status, io_req->fcp_resid);
            sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
        }
        if (io_req->fcp_resid)
            scsi_set_resid(sc_cmd, io_req->fcp_resid);
        break;
    default:
        printk(KERN_ERR PFX "scsi_cmd_compl: fcp_status = %d\n",
            io_req->fcp_status);
        break;
    }
    sc_cmd->SCp.ptr = NULL;
    sc_cmd->scsi_done(sc_cmd);
    kref_put(&io_req->refcount, bnx2fc_cmd_release);
}

int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
                   struct bnx2fc_cmd *io_req)
{
    struct fcoe_task_ctx_entry *task;
    struct fcoe_task_ctx_entry *task_page;
    struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
    struct fcoe_port *port = tgt->port;
    struct bnx2fc_interface *interface = port->priv;
    struct bnx2fc_hba *hba = interface->hba;
    struct fc_lport *lport = port->lport;
    struct fc_stats *stats;
    int task_idx, index;
    u16 xid;

    /* Initialize rest of io_req fields */
    io_req->cmd_type = BNX2FC_SCSI_CMD;
    io_req->port = port;
    io_req->tgt = tgt;
    io_req->data_xfer_len = scsi_bufflen(sc_cmd);
    sc_cmd->SCp.ptr = (char *)io_req;

    stats = per_cpu_ptr(lport->stats, get_cpu());
    if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
        io_req->io_req_flags = BNX2FC_READ;
        stats->InputRequests++;
        stats->InputBytes += io_req->data_xfer_len;
    } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
        io_req->io_req_flags = BNX2FC_WRITE;
        stats->OutputRequests++;
        stats->OutputBytes += io_req->data_xfer_len;
    } else {
        io_req->io_req_flags = 0;
        stats->ControlRequests++;
    }
    put_cpu();

    xid = io_req->xid;

    /* Build buffer descriptor list for firmware from sg list */
    if (bnx2fc_build_bd_list_from_sg(io_req)) {
        printk(KERN_ERR PFX "BD list creation failed\n");
        spin_lock_bh(&tgt->tgt_lock);
        kref_put(&io_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        return -EAGAIN;
    }

    task_idx = xid / BNX2FC_TASKS_PER_PAGE;
    index = xid % BNX2FC_TASKS_PER_PAGE;

    /* Initialize task context for this IO request */
    task_page = (struct fcoe_task_ctx_entry *) hba->task_ctx[task_idx];
    task = &(task_page[index]);
    bnx2fc_init_task(io_req, task);

    spin_lock_bh(&tgt->tgt_lock);

    if (tgt->flush_in_prog) {
        printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
        kref_put(&io_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        return -EAGAIN;
    }

    if (!test_bit(BNX2FC_FLAG_SESSION_READY, &tgt->flags)) {
        printk(KERN_ERR PFX "Session not ready...post_io\n");
        kref_put(&io_req->refcount, bnx2fc_cmd_release);
        spin_unlock_bh(&tgt->tgt_lock);
        return -EAGAIN;
    }

    /* Time IO req */
    if (tgt->io_timeout)
        bnx2fc_cmd_timer_set(io_req, BNX2FC_IO_TIMEOUT);
    /* Obtain free SQ entry */
    bnx2fc_add_2_sq(tgt, xid);

    /* Enqueue the io_req to active_cmd_queue */

    io_req->on_active_queue = 1;
    /* move io_req from pending_queue to active_queue */
    list_add_tail(&io_req->link, &tgt->active_cmd_queue);

    /* Ring doorbell */
    bnx2fc_ring_doorbell(tgt);
    spin_unlock_bh(&tgt->tgt_lock);
    return 0;
}