/*
 * This file is part of the Chelsio FCoE driver for Linux.
 *
 * Copyright (c) 2008-2012 Chelsio Communications, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/mm.h>
#include <linux/jiffies.h>
#include <scsi/fc/fc_fs.h>

#include "csio_init.h"

static void
csio_vport_set_state(struct csio_lnode *ln);

/*
 * csio_reg_rnode - Register a remote port with FC transport.
 * @rn: Rnode representing remote port.
 *
 * Call fc_remote_port_add() to register this remote port with FC transport.
 * If remote port is Initiator OR Target OR both, change the role appropriately.
 *
 */
void
csio_reg_rnode(struct csio_rnode *rn)
{
        struct csio_lnode *ln           = csio_rnode_to_lnode(rn);
        struct Scsi_Host *shost         = csio_ln_to_shost(ln);
        struct fc_rport_identifiers ids;
        struct fc_rport  *rport;
        struct csio_service_parms *sp;

        ids.node_name   = wwn_to_u64(csio_rn_wwnn(rn));
        ids.port_name   = wwn_to_u64(csio_rn_wwpn(rn));
        ids.port_id     = rn->nport_id;
        ids.roles       = FC_RPORT_ROLE_UNKNOWN;

        if (rn->role & CSIO_RNFR_INITIATOR || rn->role & CSIO_RNFR_TARGET) {
                rport = rn->rport;
                CSIO_ASSERT(rport != NULL);
                goto update_role;
        }

        rn->rport = fc_remote_port_add(shost, 0, &ids);
        if (!rn->rport) {
                csio_ln_err(ln, "Failed to register rport = 0x%x.\n",
                                        rn->nport_id);
                return;
        }

        ln->num_reg_rnodes++;
        rport = rn->rport;
        spin_lock_irq(shost->host_lock);
        *((struct csio_rnode **)rport->dd_data) = rn;
        spin_unlock_irq(shost->host_lock);

        sp = &rn->rn_sparm;
        rport->maxframe_size = ntohs(sp->csp.sp_bb_data);
        if (ntohs(sp->clsp[2].cp_class) & FC_CPC_VALID)
                rport->supported_classes = FC_COS_CLASS3;
        else
                rport->supported_classes = FC_COS_UNSPECIFIED;
update_role:
        if (rn->role & CSIO_RNFR_INITIATOR)
                ids.roles |= FC_RPORT_ROLE_FCP_INITIATOR;
        if (rn->role & CSIO_RNFR_TARGET)
                ids.roles |= FC_RPORT_ROLE_FCP_TARGET;

        if (ids.roles != FC_RPORT_ROLE_UNKNOWN)
                fc_remote_port_rolechg(rport, ids.roles);

        rn->scsi_id = rport->scsi_target_id;

        csio_ln_dbg(ln, "Remote port x%x role 0x%x registered\n",
                rn->nport_id, ids.roles);
}

/*
 * csio_unreg_rnode - Unregister a remote port with FC transport.
 * @rn: Rnode representing remote port.
 *
 * Call fc_remote_port_delete() to unregister this remote port with FC
 * transport.
 *
 */
void
csio_unreg_rnode(struct csio_rnode *rn)
{
        struct csio_lnode *ln = csio_rnode_to_lnode(rn);
        struct fc_rport *rport = rn->rport;

        rn->role &= ~(CSIO_RNFR_INITIATOR | CSIO_RNFR_TARGET);
        fc_remote_port_delete(rport);
        ln->num_reg_rnodes--;

        csio_ln_dbg(ln, "Remote port x%x un-registered\n", rn->nport_id);
}

/*
 * csio_lnode_async_event - Async events from local port.
 * @ln: lnode representing local port.
 *
 * Async events from local node that FC transport/SCSI ML
 * should be made aware of (Eg: RSCN).
 */
void
csio_lnode_async_event(struct csio_lnode *ln, enum csio_ln_fc_evt fc_evt)
{
        switch (fc_evt) {
        case CSIO_LN_FC_RSCN:
                /* Get payload of rscn from ln */
                /* For each RSCN entry */
                        /*
                         * fc_host_post_event(shost,
                         *                    fc_get_event_number(),
                         *                    FCH_EVT_RSCN,
                         *                    rscn_entry);
                         */
                break;
        case CSIO_LN_FC_LINKUP:
                /* send fc_host_post_event */
                /* set vport state */
                if (csio_is_npiv_ln(ln))
                        csio_vport_set_state(ln);

                break;
        case CSIO_LN_FC_LINKDOWN:
                /* send fc_host_post_event */
                /* set vport state */
                if (csio_is_npiv_ln(ln))
                        csio_vport_set_state(ln);

                break;
        case CSIO_LN_FC_ATTRIB_UPDATE:
                csio_fchost_attr_init(ln);
                break;
        default:
                break;
        }
}

/*
 * csio_fchost_attr_init - Initialize FC transport attributes
 * @ln: Lnode.
 *
 */
void
csio_fchost_attr_init(struct csio_lnode *ln)
{
        struct Scsi_Host  *shost = csio_ln_to_shost(ln);

        fc_host_node_name(shost) = wwn_to_u64(csio_ln_wwnn(ln));
        fc_host_port_name(shost) = wwn_to_u64(csio_ln_wwpn(ln));

        fc_host_supported_classes(shost) = FC_COS_CLASS3;
        fc_host_max_npiv_vports(shost) =
                        (csio_lnode_to_hw(ln))->fres_info.max_vnps;
        fc_host_supported_speeds(shost) = FC_PORTSPEED_10GBIT |
                FC_PORTSPEED_1GBIT;

        fc_host_maxframe_size(shost) = ntohs(ln->ln_sparm.csp.sp_bb_data);
        memset(fc_host_supported_fc4s(shost), 0,
                sizeof(fc_host_supported_fc4s(shost)));
        fc_host_supported_fc4s(shost)[7] = 1;

        memset(fc_host_active_fc4s(shost), 0,
                sizeof(fc_host_active_fc4s(shost)));
        fc_host_active_fc4s(shost)[7] = 1;
}

/*
 * csio_get_host_port_id - sysfs entries for nport_id is
 * populated/cached from this function
 */
static void
csio_get_host_port_id(struct Scsi_Host *shost)
{
        struct csio_lnode *ln   = shost_priv(shost);
        struct csio_hw *hw = csio_lnode_to_hw(ln);

        spin_lock_irq(&hw->lock);
        fc_host_port_id(shost) = ln->nport_id;
        spin_unlock_irq(&hw->lock);
}

/*
 * csio_get_port_type - Return FC local port type.
 * @shost: scsi host.
 *
 */
static void
csio_get_host_port_type(struct Scsi_Host *shost)
{
        struct csio_lnode *ln = shost_priv(shost);
        struct csio_hw *hw = csio_lnode_to_hw(ln);

        spin_lock_irq(&hw->lock);
        if (csio_is_npiv_ln(ln))
                fc_host_port_type(shost) = FC_PORTTYPE_NPIV;
        else
                fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
        spin_unlock_irq(&hw->lock);
}

/*
 * csio_get_port_state - Return FC local port state.
 * @shost: scsi host.
 *
 */
static void
csio_get_host_port_state(struct Scsi_Host *shost)
{
        struct csio_lnode *ln = shost_priv(shost);
        struct csio_hw *hw = csio_lnode_to_hw(ln);
        char state[16];

        spin_lock_irq(&hw->lock);

        csio_lnode_state_to_str(ln, state);
        if (!strcmp(state, "READY"))
                fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
        else if (!strcmp(state, "OFFLINE"))
                fc_host_port_state(shost) = FC_PORTSTATE_LINKDOWN;
        else
                fc_host_port_state(shost) = FC_PORTSTATE_UNKNOWN;

        spin_unlock_irq(&hw->lock);
}

/*
 * csio_get_host_speed - Return link speed to FC transport.
 * @shost: scsi host.
 *
 */
static void
csio_get_host_speed(struct Scsi_Host *shost)
{
        struct csio_lnode *ln = shost_priv(shost);
        struct csio_hw *hw = csio_lnode_to_hw(ln);

        spin_lock_irq(&hw->lock);
        switch (hw->pport[ln->portid].link_speed) {
        case FW_PORT_CAP32_SPEED_1G:
                fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
                break;
        case FW_PORT_CAP32_SPEED_10G:
                fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
                break;
        case FW_PORT_CAP32_SPEED_25G:
                fc_host_speed(shost) = FC_PORTSPEED_25GBIT;
                break;
        case FW_PORT_CAP32_SPEED_40G:
                fc_host_speed(shost) = FC_PORTSPEED_40GBIT;
                break;
        case FW_PORT_CAP32_SPEED_50G:
                fc_host_speed(shost) = FC_PORTSPEED_50GBIT;
                break;
        case FW_PORT_CAP32_SPEED_100G:
                fc_host_speed(shost) = FC_PORTSPEED_100GBIT;
                break;
        default:
                fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
                break;
        }
        spin_unlock_irq(&hw->lock);
}

/*
 * csio_get_host_fabric_name - Return fabric name
 * @shost: scsi host.
 *
 */
static void
csio_get_host_fabric_name(struct Scsi_Host *shost)
{
        struct csio_lnode *ln = shost_priv(shost);
        struct csio_rnode *rn = NULL;
        struct csio_hw *hw = csio_lnode_to_hw(ln);

        spin_lock_irq(&hw->lock);
        rn = csio_rnode_lookup_portid(ln, FC_FID_FLOGI);
        if (rn)
                fc_host_fabric_name(shost) = wwn_to_u64(csio_rn_wwnn(rn));
        else
                fc_host_fabric_name(shost) = 0;
        spin_unlock_irq(&hw->lock);
}

/*
 * csio_get_host_speed - Return FC transport statistics.
 * @ln: Lnode.
 *
 */
static struct fc_host_statistics *
csio_get_stats(struct Scsi_Host *shost)
{
        struct csio_lnode *ln = shost_priv(shost);
        struct csio_hw *hw = csio_lnode_to_hw(ln);
        struct fc_host_statistics *fhs = &ln->fch_stats;
        struct fw_fcoe_port_stats fcoe_port_stats;
        uint64_t seconds;

        memset(&fcoe_port_stats, 0, sizeof(struct fw_fcoe_port_stats));
        csio_get_phy_port_stats(hw, ln->portid, &fcoe_port_stats);

        fhs->tx_frames  += (be64_to_cpu(fcoe_port_stats.tx_bcast_frames) +
                            be64_to_cpu(fcoe_port_stats.tx_mcast_frames) +
                            be64_to_cpu(fcoe_port_stats.tx_ucast_frames) +
                            be64_to_cpu(fcoe_port_stats.tx_offload_frames));
        fhs->tx_words  += (be64_to_cpu(fcoe_port_stats.tx_bcast_bytes) +
                           be64_to_cpu(fcoe_port_stats.tx_mcast_bytes) +
                           be64_to_cpu(fcoe_port_stats.tx_ucast_bytes) +
                           be64_to_cpu(fcoe_port_stats.tx_offload_bytes)) /
                                                        CSIO_WORD_TO_BYTE;
        fhs->rx_frames += (be64_to_cpu(fcoe_port_stats.rx_bcast_frames) +
                           be64_to_cpu(fcoe_port_stats.rx_mcast_frames) +
                           be64_to_cpu(fcoe_port_stats.rx_ucast_frames));
        fhs->rx_words += (be64_to_cpu(fcoe_port_stats.rx_bcast_bytes) +
                          be64_to_cpu(fcoe_port_stats.rx_mcast_bytes) +
                          be64_to_cpu(fcoe_port_stats.rx_ucast_bytes)) /
                                                        CSIO_WORD_TO_BYTE;
        fhs->error_frames += be64_to_cpu(fcoe_port_stats.rx_err_frames);
        fhs->fcp_input_requests +=  ln->stats.n_input_requests;
        fhs->fcp_output_requests +=  ln->stats.n_output_requests;
        fhs->fcp_control_requests +=  ln->stats.n_control_requests;
        fhs->fcp_input_megabytes +=  ln->stats.n_input_bytes >> 20;
        fhs->fcp_output_megabytes +=  ln->stats.n_output_bytes >> 20;
        fhs->link_failure_count = ln->stats.n_link_down;
        /* Reset stats for the device */
        seconds = jiffies_to_msecs(jiffies) - hw->stats.n_reset_start;
        do_div(seconds, 1000);
        fhs->seconds_since_last_reset = seconds;

        return fhs;
}

/*
 * csio_set_rport_loss_tmo - Set the rport dev loss timeout
 * @rport: fc rport.
 * @timeout: new value for dev loss tmo.
 *
 * If timeout is non zero set the dev_loss_tmo to timeout, else set
 * dev_loss_tmo to one.
 */
static void
csio_set_rport_loss_tmo(struct fc_rport *rport, uint32_t timeout)
{
        if (timeout)
                rport->dev_loss_tmo = timeout;
        else
                rport->dev_loss_tmo = 1;
}

static void
csio_vport_set_state(struct csio_lnode *ln)
{
        struct fc_vport *fc_vport = ln->fc_vport;
        struct csio_lnode  *pln = ln->pln;
        char state[16];

        /* Set fc vport state based on phyiscal lnode */
        csio_lnode_state_to_str(pln, state);
        if (strcmp(state, "READY")) {
                fc_vport_set_state(fc_vport, FC_VPORT_LINKDOWN);
                return;
        }

        if (!(pln->flags & CSIO_LNF_NPIVSUPP)) {
                fc_vport_set_state(fc_vport, FC_VPORT_NO_FABRIC_SUPP);
                return;
        }

        /* Set fc vport state based on virtual lnode */
        csio_lnode_state_to_str(ln, state);
        if (strcmp(state, "READY")) {
                fc_vport_set_state(fc_vport, FC_VPORT_LINKDOWN);
                return;
        }
        fc_vport_set_state(fc_vport, FC_VPORT_ACTIVE);
}

static int
csio_fcoe_alloc_vnp(struct csio_hw *hw, struct csio_lnode *ln)
{
        struct csio_lnode *pln;
        struct csio_mb  *mbp;
        struct fw_fcoe_vnp_cmd *rsp;
        int ret = 0;
        int retry = 0;

        /* Issue VNP cmd to alloc vport */
        /* Allocate Mbox request */
        spin_lock_irq(&hw->lock);
        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                ret = -ENOMEM;
                goto out;
        }

        pln = ln->pln;
        ln->fcf_flowid = pln->fcf_flowid;
        ln->portid = pln->portid;

        csio_fcoe_vnp_alloc_init_mb(ln, mbp, CSIO_MB_DEFAULT_TMO,
                                    pln->fcf_flowid, pln->vnp_flowid, 0,
                                    csio_ln_wwnn(ln), csio_ln_wwpn(ln), NULL);

        for (retry = 0; retry < 3; retry++) {
                /* FW is expected to complete vnp cmd in immediate mode
                 * without much delay.
                 * Otherwise, there will be increase in IO latency since HW
                 * lock is held till completion of vnp mbox cmd.
                 */
                ret = csio_mb_issue(hw, mbp);
                if (ret != -EBUSY)
                        break;

                /* Retry if mbox returns busy */
                spin_unlock_irq(&hw->lock);
                msleep(2000);
                spin_lock_irq(&hw->lock);
        }

        if (ret) {
                csio_ln_err(ln, "Failed to issue mbox FCoE VNP command\n");
                goto out_free;
        }

        /* Process Mbox response of VNP command */
        rsp = (struct fw_fcoe_vnp_cmd *)(mbp->mb);
        if (FW_CMD_RETVAL_G(ntohl(rsp->alloc_to_len16)) != FW_SUCCESS) {
                csio_ln_err(ln, "FCOE VNP ALLOC cmd returned 0x%x!\n",
                            FW_CMD_RETVAL_G(ntohl(rsp->alloc_to_len16)));
                ret = -EINVAL;
                goto out_free;
        }

        ln->vnp_flowid = FW_FCOE_VNP_CMD_VNPI_GET(
                                ntohl(rsp->gen_wwn_to_vnpi));
        memcpy(csio_ln_wwnn(ln), rsp->vnport_wwnn, 8);
        memcpy(csio_ln_wwpn(ln), rsp->vnport_wwpn, 8);

        csio_ln_dbg(ln, "FCOE VNPI: 0x%x\n", ln->vnp_flowid);
        csio_ln_dbg(ln, "\tWWNN: %x%x%x%x%x%x%x%x\n",
                    ln->ln_sparm.wwnn[0], ln->ln_sparm.wwnn[1],
                    ln->ln_sparm.wwnn[2], ln->ln_sparm.wwnn[3],
                    ln->ln_sparm.wwnn[4], ln->ln_sparm.wwnn[5],
                    ln->ln_sparm.wwnn[6], ln->ln_sparm.wwnn[7]);
        csio_ln_dbg(ln, "\tWWPN: %x%x%x%x%x%x%x%x\n",
                    ln->ln_sparm.wwpn[0], ln->ln_sparm.wwpn[1],
                    ln->ln_sparm.wwpn[2], ln->ln_sparm.wwpn[3],
                    ln->ln_sparm.wwpn[4], ln->ln_sparm.wwpn[5],
                    ln->ln_sparm.wwpn[6], ln->ln_sparm.wwpn[7]);

out_free:
        mempool_free(mbp, hw->mb_mempool);
out:
        spin_unlock_irq(&hw->lock);
        return ret;
}

static int
csio_fcoe_free_vnp(struct csio_hw *hw, struct csio_lnode *ln)
{
        struct csio_lnode *pln;
        struct csio_mb  *mbp;
        struct fw_fcoe_vnp_cmd *rsp;
        int ret = 0;
        int retry = 0;

        /* Issue VNP cmd to free vport */
        /* Allocate Mbox request */

        spin_lock_irq(&hw->lock);
        mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
        if (!mbp) {
                CSIO_INC_STATS(hw, n_err_nomem);
                ret = -ENOMEM;
                goto out;
        }

        pln = ln->pln;

        csio_fcoe_vnp_free_init_mb(ln, mbp, CSIO_MB_DEFAULT_TMO,
                                   ln->fcf_flowid, ln->vnp_flowid,
                                   NULL);

        for (retry = 0; retry < 3; retry++) {
                ret = csio_mb_issue(hw, mbp);
                if (ret != -EBUSY)
                        break;

                /* Retry if mbox returns busy */
                spin_unlock_irq(&hw->lock);
                msleep(2000);
                spin_lock_irq(&hw->lock);
        }

        if (ret) {
                csio_ln_err(ln, "Failed to issue mbox FCoE VNP command\n");
                goto out_free;
        }

        /* Process Mbox response of VNP command */
        rsp = (struct fw_fcoe_vnp_cmd *)(mbp->mb);
        if (FW_CMD_RETVAL_G(ntohl(rsp->alloc_to_len16)) != FW_SUCCESS) {
                csio_ln_err(ln, "FCOE VNP FREE cmd returned 0x%x!\n",
                            FW_CMD_RETVAL_G(ntohl(rsp->alloc_to_len16)));
                ret = -EINVAL;
        }

out_free:
        mempool_free(mbp, hw->mb_mempool);
out:
        spin_unlock_irq(&hw->lock);
        return ret;
}

static int
csio_vport_create(struct fc_vport *fc_vport, bool disable)
{
        struct Scsi_Host *shost = fc_vport->shost;
        struct csio_lnode *pln = shost_priv(shost);
        struct csio_lnode *ln = NULL;
        struct csio_hw *hw = csio_lnode_to_hw(pln);
        uint8_t wwn[8];
        int ret = -1;

        ln = csio_shost_init(hw, &fc_vport->dev, false, pln);
        if (!ln)
                goto error;

        if (fc_vport->node_name != 0) {
                u64_to_wwn(fc_vport->node_name, wwn);

                if (!CSIO_VALID_WWN(wwn)) {
                        csio_ln_err(ln,
                                    "vport create failed. Invalid wwnn\n");
                        goto error;
                }
                memcpy(csio_ln_wwnn(ln), wwn, 8);
        }

        if (fc_vport->port_name != 0) {
                u64_to_wwn(fc_vport->port_name, wwn);

                if (!CSIO_VALID_WWN(wwn)) {
                        csio_ln_err(ln,
                                    "vport create failed. Invalid wwpn\n");
                        goto error;
                }

                if (csio_lnode_lookup_by_wwpn(hw, wwn)) {
                        csio_ln_err(ln,
                            "vport create failed. wwpn already exists\n");
                        goto error;
                }
                memcpy(csio_ln_wwpn(ln), wwn, 8);
        }

        fc_vport_set_state(fc_vport, FC_VPORT_INITIALIZING);

        if (csio_fcoe_alloc_vnp(hw, ln))
                goto error;

        *(struct csio_lnode **)fc_vport->dd_data = ln;
        ln->fc_vport = fc_vport;
        if (!fc_vport->node_name)
                fc_vport->node_name = wwn_to_u64(csio_ln_wwnn(ln));
        if (!fc_vport->port_name)
                fc_vport->port_name = wwn_to_u64(csio_ln_wwpn(ln));
        csio_fchost_attr_init(ln);
        return 0;
error:
        if (ln)
                csio_shost_exit(ln);

        return ret;
}

static int
csio_vport_delete(struct fc_vport *fc_vport)
{
        struct csio_lnode *ln = *(struct csio_lnode **)fc_vport->dd_data;
        struct Scsi_Host *shost = csio_ln_to_shost(ln);
        struct csio_hw *hw = csio_lnode_to_hw(ln);
        int rmv;

        spin_lock_irq(&hw->lock);
        rmv = csio_is_hw_removing(hw);
        spin_unlock_irq(&hw->lock);

        if (rmv) {
                csio_shost_exit(ln);
                return 0;
        }

        /* Quiesce ios and send remove event to lnode */
        scsi_block_requests(shost);
        spin_lock_irq(&hw->lock);
        csio_scsim_cleanup_io_lnode(csio_hw_to_scsim(hw), ln);
        csio_lnode_close(ln);
        spin_unlock_irq(&hw->lock);
        scsi_unblock_requests(shost);

        /* Free vnp */
        if (fc_vport->vport_state !=  FC_VPORT_DISABLED)
                csio_fcoe_free_vnp(hw, ln);

        csio_shost_exit(ln);
        return 0;
}

static int
csio_vport_disable(struct fc_vport *fc_vport, bool disable)
{
        struct csio_lnode *ln = *(struct csio_lnode **)fc_vport->dd_data;
        struct Scsi_Host *shost = csio_ln_to_shost(ln);
        struct csio_hw *hw = csio_lnode_to_hw(ln);

        /* disable vport */
        if (disable) {
                /* Quiesce ios and send stop event to lnode */
                scsi_block_requests(shost);
                spin_lock_irq(&hw->lock);
                csio_scsim_cleanup_io_lnode(csio_hw_to_scsim(hw), ln);
                csio_lnode_stop(ln);
                spin_unlock_irq(&hw->lock);
                scsi_unblock_requests(shost);

                /* Free vnp */
                csio_fcoe_free_vnp(hw, ln);
                fc_vport_set_state(fc_vport, FC_VPORT_DISABLED);
                csio_ln_err(ln, "vport disabled\n");
                return 0;
        } else {
                /* enable vport */
                fc_vport_set_state(fc_vport, FC_VPORT_INITIALIZING);
                if (csio_fcoe_alloc_vnp(hw, ln)) {
                        csio_ln_err(ln, "vport enabled failed.\n");
                        return -1;
                }
                csio_ln_err(ln, "vport enabled\n");
                return 0;
        }
}

static void
csio_dev_loss_tmo_callbk(struct fc_rport *rport)
{
        struct csio_rnode *rn;
        struct csio_hw *hw;
        struct csio_lnode *ln;

        rn = *((struct csio_rnode **)rport->dd_data);
        ln = csio_rnode_to_lnode(rn);
        hw = csio_lnode_to_hw(ln);

        spin_lock_irq(&hw->lock);

        /* return if driver is being removed or same rnode comes back online */
        if (csio_is_hw_removing(hw) || csio_is_rnode_ready(rn))
                goto out;

        csio_ln_dbg(ln, "devloss timeout on rnode:%p portid:x%x flowid:x%x\n",
                    rn, rn->nport_id, csio_rn_flowid(rn));

        CSIO_INC_STATS(ln, n_dev_loss_tmo);

        /*
         * enqueue devloss event to event worker thread to serialize all
         * rnode events.
         */
        if (csio_enqueue_evt(hw, CSIO_EVT_DEV_LOSS, &rn, sizeof(rn))) {
                CSIO_INC_STATS(hw, n_evt_drop);
                goto out;
        }

        if (!(hw->flags & CSIO_HWF_FWEVT_PENDING)) {
                hw->flags |= CSIO_HWF_FWEVT_PENDING;
                spin_unlock_irq(&hw->lock);
                schedule_work(&hw->evtq_work);
                return;
        }

out:
        spin_unlock_irq(&hw->lock);
}

/* FC transport functions template - Physical port */
struct fc_function_template csio_fc_transport_funcs = {
        .show_host_node_name = 1,
        .show_host_port_name = 1,
        .show_host_supported_classes = 1,
        .show_host_supported_fc4s = 1,
        .show_host_maxframe_size = 1,

        .get_host_port_id = csio_get_host_port_id,
        .show_host_port_id = 1,

        .get_host_port_type = csio_get_host_port_type,
        .show_host_port_type = 1,

        .get_host_port_state = csio_get_host_port_state,
        .show_host_port_state = 1,

        .show_host_active_fc4s = 1,
        .get_host_speed = csio_get_host_speed,
        .show_host_speed = 1,
        .get_host_fabric_name = csio_get_host_fabric_name,
        .show_host_fabric_name = 1,

        .get_fc_host_stats = csio_get_stats,

        .dd_fcrport_size = sizeof(struct csio_rnode *),
        .show_rport_maxframe_size = 1,
        .show_rport_supported_classes = 1,

        .set_rport_dev_loss_tmo = csio_set_rport_loss_tmo,
        .show_rport_dev_loss_tmo = 1,

        .show_starget_port_id = 1,
        .show_starget_node_name = 1,
        .show_starget_port_name = 1,

        .dev_loss_tmo_callbk = csio_dev_loss_tmo_callbk,
        .dd_fcvport_size = sizeof(struct csio_lnode *),

        .vport_create = csio_vport_create,
        .vport_disable = csio_vport_disable,
        .vport_delete = csio_vport_delete,
};

/* FC transport functions template - Virtual  port */
struct fc_function_template csio_fc_transport_vport_funcs = {
        .show_host_node_name = 1,
        .show_host_port_name = 1,
        .show_host_supported_classes = 1,
        .show_host_supported_fc4s = 1,
        .show_host_maxframe_size = 1,

        .get_host_port_id = csio_get_host_port_id,
        .show_host_port_id = 1,

        .get_host_port_type = csio_get_host_port_type,
        .show_host_port_type = 1,

        .get_host_port_state = csio_get_host_port_state,
        .show_host_port_state = 1,
        .show_host_active_fc4s = 1,

        .get_host_speed = csio_get_host_speed,
        .show_host_speed = 1,

        .get_host_fabric_name = csio_get_host_fabric_name,
        .show_host_fabric_name = 1,

        .get_fc_host_stats = csio_get_stats,

        .dd_fcrport_size = sizeof(struct csio_rnode *),
        .show_rport_maxframe_size = 1,
        .show_rport_supported_classes = 1,

        .set_rport_dev_loss_tmo = csio_set_rport_loss_tmo,
        .show_rport_dev_loss_tmo = 1,

        .show_starget_port_id = 1,
        .show_starget_node_name = 1,
        .show_starget_port_name = 1,

        .dev_loss_tmo_callbk = csio_dev_loss_tmo_callbk,

};