/* bnx2fc_io.c: QLogic Linux FCoE offload driver.
 * IO manager and SCSI IO processing.
 *
 * Copyright (c) 2008-2013 Broadcom Corporation
 * Copyright (c) 2014-2016 QLogic Corporation
 * Copyright (c) 2016-2017 Cavium Inc.
 *
 * 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 (bprakash@broadcom.com)
 */

#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);
        u8 cmd_type = io_req->cmd_type;
        struct bnx2fc_rport *tgt = io_req->tgt;
        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->abts_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",
                                        kref_read(&io_req->refcount));
                        if (!(test_and_set_bit(BNX2FC_FLAG_ABTS_DONE,
                                               &io_req->req_flags))) {
                                /*
                                 * Cleanup and return original command to
                                 * mid-layer.
                                 */
                                bnx2fc_initiate_cleanup(io_req);
                                kref_put(&io_req->refcount, bnx2fc_cmd_release);
                                spin_unlock_bh(&tgt->tgt_lock);

                                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;

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

                                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)) {
                                kref_put(&io_req->refcount, bnx2fc_cmd_release);
                                spin_unlock_bh(&tgt->tgt_lock);

                                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;

        /* Sanity checks before returning command to mid-layer */
        if (!sc_cmd) {
                printk(KERN_ERR PFX "scsi_done - sc_cmd NULL. "
                                    "IO(0x%x) already cleaned up\n",
                       io_req->xid);
                return;
        }
        if (!sc_cmd->device) {
                pr_err(PFX "0x%x: sc_cmd->device is NULL.\n", io_req->xid);
                return;
        }
        if (!sc_cmd->device->host) {
                pr_err(PFX "0x%x: sc_cmd->device->host is NULL.\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)
{
        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;
        u16 min_xid = BNX2FC_MIN_XID;
        u16 max_xid = hba->max_xid;

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

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

        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 - hba->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 = kzalloc(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 = hba->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, CNIC_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, CNIC_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));

        if (io_req->cmd_type != BNX2FC_ELS) {
                mp_req->req_len = sizeof(struct fcp_cmnd);
                io_req->data_xfer_len = mp_req->req_len;
        } else
                mp_req->req_len = io_req->data_xfer_len;

        mp_req->req_buf = dma_alloc_coherent(&hba->pcidev->dev, CNIC_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, CNIC_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, CNIC_PAGE_SIZE);
        memset(mp_req->resp_buf, 0, CNIC_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_resp_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 = CNIC_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 = CNIC_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;
        struct fc_rport_libfc_priv *rp;
        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);
        rport = starget_to_rport(scsi_target(sc_cmd->device));
        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;
        }
        rp = rport->dd_data;

        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->abts_done);
        io_req->wait_for_abts_comp = 1;

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

        rc = wait_for_completion_timeout(&io_req->abts_done,
                                         interface->tm_timeout * HZ);
        spin_lock_bh(&tgt->tgt_lock);

        io_req->wait_for_abts_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_cleanup_comp = 1;
                init_completion(&io_req->cleanup_done);
                bnx2fc_initiate_cleanup(io_req);
                spin_unlock_bh(&tgt->tgt_lock);
                rc = wait_for_completion_timeout(&io_req->cleanup_done,
                                                 BNX2FC_FW_TIMEOUT);
                spin_lock_bh(&tgt->tgt_lock);
                io_req->wait_for_cleanup_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 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;

        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 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;

        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);

        /* Set flag that cleanup request is pending with the firmware */
        set_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);

        /* Ring doorbell */
        bnx2fc_ring_doorbell(tgt);

cleanup_err:
        return rc;
}

/**
 * bnx2fc_eh_target_reset: Reset a target
 *
 * @sc_cmd:     SCSI command
 *
 * Set from SCSI host template to send task mgmt command to the target
 *      and wait for the response
 */
int bnx2fc_eh_target_reset(struct scsi_cmnd *sc_cmd)
{
        return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_TGT_RESET);
}

/**
 * bnx2fc_eh_device_reset - Reset a single LUN
 *
 * @sc_cmd:     SCSI command
 *
 * Set from SCSI host template to send task mgmt command to the target
 *      and wait for the response
 */
int bnx2fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
{
        return bnx2fc_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
}

static int bnx2fc_abts_cleanup(struct bnx2fc_cmd *io_req)
{
        struct bnx2fc_rport *tgt = io_req->tgt;
        unsigned int time_left;

        init_completion(&io_req->cleanup_done);
        io_req->wait_for_cleanup_comp = 1;
        bnx2fc_initiate_cleanup(io_req);

        spin_unlock_bh(&tgt->tgt_lock);

        /*
         * Can't wait forever on cleanup response lest we let the SCSI error
         * handler wait forever
         */
        time_left = wait_for_completion_timeout(&io_req->cleanup_done,
                                                BNX2FC_FW_TIMEOUT);
        if (!time_left) {
                BNX2FC_IO_DBG(io_req, "%s(): Wait for cleanup timed out.\n",
                              __func__);

                /*
                 * Put the extra reference to the SCSI command since it would
                 * not have been returned in this case.
                 */
                kref_put(&io_req->refcount, bnx2fc_cmd_release);
        }

        spin_lock_bh(&tgt->tgt_lock);
        io_req->wait_for_cleanup_comp = 0;
        return SUCCESS;
}

/**
 * bnx2fc_eh_abort - eh_abort_handler api to abort an outstanding
 *                      SCSI command
 *
 * @sc_cmd:     SCSI_ML command pointer
 *
 * SCSI abort request handler
 */
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;
        unsigned int time_left;

        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 FAILED;
        }

        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",
                      kref_read(&io_req->refcount));

        /* 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);
                /*
                 * The IO is still with the FW.
                 * Return failure and let SCSI-ml retry eh_abort.
                 */
                spin_unlock_bh(&tgt->tgt_lock);
                return FAILED;
        }

        /*
         * 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->abts_done);
        init_completion(&io_req->cleanup_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 */
                /*
                 * We don't want to hold off the upper layer timer so simply
                 * cleanup the command and return that I/O was successfully
                 * aborted.
                 */
                rc = bnx2fc_abts_cleanup(io_req);
                /* This only occurs when an task abort was requested while ABTS
                   is in progress.  Setting the IO_CLEANUP flag will skip the
                   RRQ process in the case when the fw generated SCSI_CMD cmpl
                   was a result from the ABTS request rather than the CLEANUP
                   request */
                set_bit(BNX2FC_FLAG_IO_CLEANUP, &io_req->req_flags);
                goto done;
        }

        /* 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_abts_comp = 1;
        rc = bnx2fc_initiate_abts(io_req);
        if (rc == FAILED) {
                io_req->wait_for_cleanup_comp = 1;
                bnx2fc_initiate_cleanup(io_req);
                spin_unlock_bh(&tgt->tgt_lock);
                wait_for_completion(&io_req->cleanup_done);
                spin_lock_bh(&tgt->tgt_lock);
                io_req->wait_for_cleanup_comp = 0;
                goto done;
        }
        spin_unlock_bh(&tgt->tgt_lock);

        /* Wait 2 * RA_TOV + 1 to be sure timeout function hasn't fired */
        time_left = wait_for_completion_timeout(&io_req->abts_done,
                                        msecs_to_jiffies(2 * rp->r_a_tov + 1));
        if (time_left)
                BNX2FC_IO_DBG(io_req,
                              "Timed out in eh_abort waiting for abts_done");

        spin_lock_bh(&tgt->tgt_lock);
        io_req->wait_for_abts_comp = 0;
        if (test_bit(BNX2FC_FLAG_IO_COMPL, &io_req->req_flags)) {
                BNX2FC_IO_DBG(io_req, "IO completed in a different context\n");
                rc = SUCCESS;
        } else 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);
                /*
                 * Cleanup firmware residuals before returning control back
                 * to SCSI ML.
                 */
                rc = bnx2fc_abts_cleanup(io_req);
                goto done;
        } 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);
        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",
                   kref_read(&io_req->refcount), io_req->cmd_type);
        /*
         * Test whether there is a cleanup request pending. If not just
         * exit.
         */
        if (!test_and_clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ,
                                &io_req->req_flags))
                return;
        /*
         * If we receive a cleanup completion for this request then the
         * firmware will not give us an abort completion for this request
         * so clear any ABTS pending flags.
         */
        if (test_bit(BNX2FC_FLAG_ISSUE_ABTS, &io_req->req_flags) &&
            !test_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags)) {
                set_bit(BNX2FC_FLAG_ABTS_DONE, &io_req->req_flags);
                if (io_req->wait_for_abts_comp)
                        complete(&io_req->abts_done);
        }

        bnx2fc_scsi_done(io_req, DID_ERROR);
        kref_put(&io_req->refcount, bnx2fc_cmd_release);
        if (io_req->wait_for_cleanup_comp)
                complete(&io_req->cleanup_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,
                   kref_read(&io_req->refcount), 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;
        }

        /*
         * If we receive an ABTS completion here then we will not receive
         * a cleanup completion so clear any cleanup pending flags.
         */
        if (test_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags)) {
                clear_bit(BNX2FC_FLAG_ISSUE_CLEANUP_REQ, &io_req->req_flags);
                if (io_req->wait_for_cleanup_comp)
                        complete(&io_req->cleanup_done);
        }

        /* 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_abts_comp) {
                if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
                                       &io_req->req_flags))
                        complete(&io_req->abts_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;
        u64 tm_lun = sc_cmd->device->lun;
        u64 lun;
        int rc = 0;

        /* 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_abts_comp) {
                BNX2FC_IO_DBG(io_req, "tm_compl - wake up the waiter\n");
                complete(&io_req->abts_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;

        WARN_ON(scsi_sg_count(sc) > BNX2FC_MAX_BDS_PER_CMD);
        /*
         * Use dma_map_sg directly to ensure we're using the correct
         * dev struct off of pcidev.
         */
        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 the command to ML if BD count exceeds the max number
         * that can be handled by FW.
         */
        if (bd_count > BNX2FC_FW_MAX_BDS_PER_CMD) {
                pr_err("bd_count = %d exceeded FW supported max BD(255), task_id = 0x%x\n",
                       bd_count, io_req->xid);
                return -ENOMEM;
        }

        return 0;
}

static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
{
        struct scsi_cmnd *sc = io_req->sc_cmd;
        struct bnx2fc_interface *interface = io_req->port->priv;
        struct bnx2fc_hba *hba = interface->hba;

        /*
         * Use dma_unmap_sg directly to ensure we're using the correct
         * dev struct off of pcidev.
         */
        if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
                dma_unmap_sg(&hba->pcidev->dev, scsi_sglist(sc),
                    scsi_sg_count(sc), sc->sc_data_direction);
                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;

        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;
        fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
}

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 = 0;
        if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
            FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
                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];
                        BNX2FC_IO_DBG(io_req, "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);
        }
}

/**
 * bnx2fc_queuecommand - Queuecommand function of the scsi template
 *
 * @host:       The Scsi_Host the command was issued to
 * @sc_cmd:     struct scsi_cmnd to be executed
 *
 * This is the IO strategy routine, called by SCSI-ML
 **/
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;
        }
        if (tgt->retry_delay_timestamp) {
                if (time_after(jiffies, tgt->retry_delay_timestamp)) {
                        tgt->retry_delay_timestamp = 0;
                } else {
                        /* If retry_delay timer is active, flow off the ML */
                        rc = SCSI_MLQUEUE_TARGET_BUSY;
                        goto exit_qcmd;
                }
        }

        spin_lock_bh(&tgt->tgt_lock);

        io_req = bnx2fc_cmd_alloc(tgt);
        if (!io_req) {
                rc = SCSI_MLQUEUE_HOST_BUSY;
                goto exit_qcmd_tgtlock;
        }
        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_tgtlock;
        }

exit_qcmd_tgtlock:
        spin_unlock_bh(&tgt->tgt_lock);
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;
        u16 scope = 0, qualifier = 0;

        /* 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");
                return;
        }

        /* 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);

        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_abts_comp)
                        if (test_and_clear_bit(BNX2FC_FLAG_EH_ABORT,
                                               &io_req->req_flags))
                                complete(&io_req->abts_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->cdb_status == SAM_STAT_TASK_SET_FULL ||
                            io_req->cdb_status == SAM_STAT_BUSY) {
                                /* Newer array firmware with BUSY or
                                 * TASK_SET_FULL may return a status that needs
                                 * the scope bits masked.
                                 * Or a huge delay timestamp up to 27 minutes
                                 * can result.
                                 */
                                if (fcp_rsp->retry_delay_timer) {

                                        /* Upper 2 bits */
                                        scope = fcp_rsp->retry_delay_timer
                                                & 0xC000;
                                        /* Lower 14 bits */
                                        qualifier = fcp_rsp->retry_delay_timer
                                                & 0x3FFF;
                                }
                                if (scope > 0 && qualifier > 0 &&
                                        qualifier <= 0x3FEF) {
                                        /* Set the jiffies +
                                         * retry_delay_timer * 100ms
                                         * for the rport/tgt
                                         */
                                        tgt->retry_delay_timestamp = jiffies +
                                                (qualifier * HZ / 10);
                                }
                        }
                }
                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;

        /* bnx2fc_post_io_req() is called with the tgt_lock held */

        /* 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");
                kref_put(&io_req->refcount, bnx2fc_cmd_release);
                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);

        if (tgt->flush_in_prog) {
                printk(KERN_ERR PFX "Flush in progress..Host Busy\n");
                kref_put(&io_req->refcount, bnx2fc_cmd_release);
                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);
                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);
        return 0;
}