fcoe.c

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/*
 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Maintained at www.Open-FCoE.org
 */

#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/crc32.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/fs.h>
#include <linux/sysfs.h>
#include <linux/ctype.h>
#include <linux/workqueue.h>
#include <net/dcbnl.h>
#include <net/dcbevent.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <net/rtnetlink.h>

#include <scsi/fc/fc_encaps.h>
#include <scsi/fc/fc_fip.h>
#include <scsi/fc/fc_fcoe.h>

#include <scsi/libfc.h>
#include <scsi/fc_frame.h>
#include <scsi/libfcoe.h>

#include "fcoe.h"

MODULE_AUTHOR("Open-FCoE.org");
MODULE_DESCRIPTION("FCoE");
MODULE_LICENSE("GPL v2");

/* Performance tuning parameters for fcoe */
static unsigned int fcoe_ddp_min = 4096;
module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for "  \
         "Direct Data Placement (DDP).");

unsigned int fcoe_debug_logging;
module_param_named(debug_logging, fcoe_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");

static DEFINE_MUTEX(fcoe_config_mutex);

static struct workqueue_struct *fcoe_wq;

/* fcoe_percpu_clean completion.  Waiter protected by fcoe_create_mutex */
static DECLARE_COMPLETION(fcoe_flush_completion);

/* fcoe host list */
/* must only by accessed under the RTNL mutex */
static LIST_HEAD(fcoe_hostlist);
static DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu);

/* Function Prototypes */
static int fcoe_reset(struct Scsi_Host *);
static int fcoe_xmit(struct fc_lport *, struct fc_frame *);
static int fcoe_rcv(struct sk_buff *, struct net_device *,
            struct packet_type *, struct net_device *);
static int fcoe_percpu_receive_thread(void *);
static void fcoe_percpu_clean(struct fc_lport *);
static int fcoe_link_speed_update(struct fc_lport *);
static int fcoe_link_ok(struct fc_lport *);

static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *);
static int fcoe_hostlist_add(const struct fc_lport *);

static int fcoe_device_notification(struct notifier_block *, ulong, void *);
static void fcoe_dev_setup(void);
static void fcoe_dev_cleanup(void);
static struct fcoe_interface
*fcoe_hostlist_lookup_port(const struct net_device *);

static int fcoe_fip_recv(struct sk_buff *, struct net_device *,
             struct packet_type *, struct net_device *);

static void fcoe_fip_send(struct fcoe_ctlr *, struct sk_buff *);
static void fcoe_update_src_mac(struct fc_lport *, u8 *);
static u8 *fcoe_get_src_mac(struct fc_lport *);
static void fcoe_destroy_work(struct work_struct *);

static int fcoe_ddp_setup(struct fc_lport *, u16, struct scatterlist *,
              unsigned int);
static int fcoe_ddp_done(struct fc_lport *, u16);
static int fcoe_ddp_target(struct fc_lport *, u16, struct scatterlist *,
               unsigned int);
static int fcoe_cpu_callback(struct notifier_block *, unsigned long, void *);
static int fcoe_dcb_app_notification(struct notifier_block *notifier,
                     ulong event, void *ptr);

static bool fcoe_match(struct net_device *netdev);
static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode);
static int fcoe_destroy(struct net_device *netdev);
static int fcoe_enable(struct net_device *netdev);
static int fcoe_disable(struct net_device *netdev);

static struct fc_seq *fcoe_elsct_send(struct fc_lport *,
                      u32 did, struct fc_frame *,
                      unsigned int op,
                      void (*resp)(struct fc_seq *,
                           struct fc_frame *,
                           void *),
                      void *, u32 timeout);
static void fcoe_recv_frame(struct sk_buff *skb);

static void fcoe_get_lesb(struct fc_lport *, struct fc_els_lesb *);

/* notification function for packets from net device */
static struct notifier_block fcoe_notifier = {
    .notifier_call = fcoe_device_notification,
};

/* notification function for CPU hotplug events */
static struct notifier_block fcoe_cpu_notifier = {
    .notifier_call = fcoe_cpu_callback,
};

/* notification function for DCB events */
static struct notifier_block dcb_notifier = {
    .notifier_call = fcoe_dcb_app_notification,
};

static struct scsi_transport_template *fcoe_nport_scsi_transport;
static struct scsi_transport_template *fcoe_vport_scsi_transport;

static int fcoe_vport_destroy(struct fc_vport *);
static int fcoe_vport_create(struct fc_vport *, bool disabled);
static int fcoe_vport_disable(struct fc_vport *, bool disable);
static void fcoe_set_vport_symbolic_name(struct fc_vport *);
static void fcoe_set_port_id(struct fc_lport *, u32, struct fc_frame *);
static void fcoe_ctlr_get_lesb(struct fcoe_ctlr_device *);
static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *);

static struct fcoe_sysfs_function_template fcoe_sysfs_templ = {
    .get_fcoe_ctlr_mode = fcoe_ctlr_get_fip_mode,
    .get_fcoe_ctlr_link_fail = fcoe_ctlr_get_lesb,
    .get_fcoe_ctlr_vlink_fail = fcoe_ctlr_get_lesb,
    .get_fcoe_ctlr_miss_fka = fcoe_ctlr_get_lesb,
    .get_fcoe_ctlr_symb_err = fcoe_ctlr_get_lesb,
    .get_fcoe_ctlr_err_block = fcoe_ctlr_get_lesb,
    .get_fcoe_ctlr_fcs_error = fcoe_ctlr_get_lesb,

    .get_fcoe_fcf_selected = fcoe_fcf_get_selected,
    .get_fcoe_fcf_vlan_id = fcoe_fcf_get_vlan_id,
};

static struct libfc_function_template fcoe_libfc_fcn_templ = {
    .frame_send = fcoe_xmit,
    .ddp_setup = fcoe_ddp_setup,
    .ddp_done = fcoe_ddp_done,
    .ddp_target = fcoe_ddp_target,
    .elsct_send = fcoe_elsct_send,
    .get_lesb = fcoe_get_lesb,
    .lport_set_port_id = fcoe_set_port_id,
};

static struct fc_function_template fcoe_nport_fc_functions = {
    .show_host_node_name = 1,
    .show_host_port_name = 1,
    .show_host_supported_classes = 1,
    .show_host_supported_fc4s = 1,
    .show_host_active_fc4s = 1,
    .show_host_maxframe_size = 1,
    .show_host_serial_number = 1,
    .show_host_manufacturer = 1,
    .show_host_model = 1,
    .show_host_model_description = 1,
    .show_host_hardware_version = 1,
    .show_host_driver_version = 1,
    .show_host_firmware_version = 1,
    .show_host_optionrom_version = 1,

    .show_host_port_id = 1,
    .show_host_supported_speeds = 1,
    .get_host_speed = fc_get_host_speed,
    .show_host_speed = 1,
    .show_host_port_type = 1,
    .get_host_port_state = fc_get_host_port_state,
    .show_host_port_state = 1,
    .show_host_symbolic_name = 1,

    .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
    .show_rport_maxframe_size = 1,
    .show_rport_supported_classes = 1,

    .show_host_fabric_name = 1,
    .show_starget_node_name = 1,
    .show_starget_port_name = 1,
    .show_starget_port_id = 1,
    .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
    .show_rport_dev_loss_tmo = 1,
    .get_fc_host_stats = fc_get_host_stats,
    .issue_fc_host_lip = fcoe_reset,

    .terminate_rport_io = fc_rport_terminate_io,

    .vport_create = fcoe_vport_create,
    .vport_delete = fcoe_vport_destroy,
    .vport_disable = fcoe_vport_disable,
    .set_vport_symbolic_name = fcoe_set_vport_symbolic_name,

    .bsg_request = fc_lport_bsg_request,
};

static struct fc_function_template fcoe_vport_fc_functions = {
    .show_host_node_name = 1,
    .show_host_port_name = 1,
    .show_host_supported_classes = 1,
    .show_host_supported_fc4s = 1,
    .show_host_active_fc4s = 1,
    .show_host_maxframe_size = 1,
    .show_host_serial_number = 1,
    .show_host_manufacturer = 1,
    .show_host_model = 1,
    .show_host_model_description = 1,
    .show_host_hardware_version = 1,
    .show_host_driver_version = 1,
    .show_host_firmware_version = 1,
    .show_host_optionrom_version = 1,

    .show_host_port_id = 1,
    .show_host_supported_speeds = 1,
    .get_host_speed = fc_get_host_speed,
    .show_host_speed = 1,
    .show_host_port_type = 1,
    .get_host_port_state = fc_get_host_port_state,
    .show_host_port_state = 1,
    .show_host_symbolic_name = 1,

    .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
    .show_rport_maxframe_size = 1,
    .show_rport_supported_classes = 1,

    .show_host_fabric_name = 1,
    .show_starget_node_name = 1,
    .show_starget_port_name = 1,
    .show_starget_port_id = 1,
    .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
    .show_rport_dev_loss_tmo = 1,
    .get_fc_host_stats = fc_get_host_stats,
    .issue_fc_host_lip = fcoe_reset,

    .terminate_rport_io = fc_rport_terminate_io,

    .bsg_request = fc_lport_bsg_request,
};

static struct scsi_host_template fcoe_shost_template = {
    .module = THIS_MODULE,
    .name = "FCoE Driver",
    .proc_name = FCOE_NAME,
    .queuecommand = fc_queuecommand,
    .eh_abort_handler = fc_eh_abort,
    .eh_device_reset_handler = fc_eh_device_reset,
    .eh_host_reset_handler = fc_eh_host_reset,
    .slave_alloc = fc_slave_alloc,
    .change_queue_depth = fc_change_queue_depth,
    .change_queue_type = fc_change_queue_type,
    .this_id = -1,
    .cmd_per_lun = 3,
    .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
    .use_clustering = ENABLE_CLUSTERING,
    .sg_tablesize = SG_ALL,
    .max_sectors = 0xffff,
};

static int fcoe_interface_setup(struct fcoe_interface *fcoe,
                struct net_device *netdev)
{
    struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
    struct netdev_hw_addr *ha;
    struct net_device *real_dev;
    u8 flogi_maddr[ETH_ALEN];
    const struct net_device_ops *ops;

    fcoe->netdev = netdev;

    /* Let LLD initialize for FCoE */
    ops = netdev->netdev_ops;
    if (ops->ndo_fcoe_enable) {
        if (ops->ndo_fcoe_enable(netdev))
            FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE"
                    " specific feature for LLD.\n");
    }

    /* Do not support for bonding device */
    if (netdev->priv_flags & IFF_BONDING && netdev->flags & IFF_MASTER) {
        FCOE_NETDEV_DBG(netdev, "Bonded interfaces not supported\n");
        return -EOPNOTSUPP;
    }

    /* look for SAN MAC address, if multiple SAN MACs exist, only
     * use the first one for SPMA */
    real_dev = (netdev->priv_flags & IFF_802_1Q_VLAN) ?
        vlan_dev_real_dev(netdev) : netdev;
    fcoe->realdev = real_dev;
    rcu_read_lock();
    for_each_dev_addr(real_dev, ha) {
        if ((ha->type == NETDEV_HW_ADDR_T_SAN) &&
            (is_valid_ether_addr(ha->addr))) {
            memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN);
            fip->spma = 1;
            break;
        }
    }
    rcu_read_unlock();

    /* setup Source Mac Address */
    if (!fip->spma)
        memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len);

    /*
     * Add FCoE MAC address as second unicast MAC address
     * or enter promiscuous mode if not capable of listening
     * for multiple unicast MACs.
     */
    memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
    dev_uc_add(netdev, flogi_maddr);
    if (fip->spma)
        dev_uc_add(netdev, fip->ctl_src_addr);
    if (fip->mode == FIP_MODE_VN2VN) {
        dev_mc_add(netdev, FIP_ALL_VN2VN_MACS);
        dev_mc_add(netdev, FIP_ALL_P2P_MACS);
    } else
        dev_mc_add(netdev, FIP_ALL_ENODE_MACS);

    /*
     * setup the receive function from ethernet driver
     * on the ethertype for the given device
     */
    fcoe->fcoe_packet_type.func = fcoe_rcv;
    fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
    fcoe->fcoe_packet_type.dev = netdev;
    dev_add_pack(&fcoe->fcoe_packet_type);

    fcoe->fip_packet_type.func = fcoe_fip_recv;
    fcoe->fip_packet_type.type = htons(ETH_P_FIP);
    fcoe->fip_packet_type.dev = netdev;
    dev_add_pack(&fcoe->fip_packet_type);

    return 0;
}

static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev,
                            enum fip_state fip_mode)
{
    struct fcoe_ctlr_device *ctlr_dev;
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;
    int size;
    int err;

    if (!try_module_get(THIS_MODULE)) {
        FCOE_NETDEV_DBG(netdev,
                "Could not get a reference to the module\n");
        fcoe = ERR_PTR(-EBUSY);
        goto out;
    }

    size = sizeof(struct fcoe_ctlr) + sizeof(struct fcoe_interface);
    ctlr_dev = fcoe_ctlr_device_add(&netdev->dev, &fcoe_sysfs_templ,
                    size);
    if (!ctlr_dev) {
        FCOE_DBG("Failed to add fcoe_ctlr_device\n");
        fcoe = ERR_PTR(-ENOMEM);
        goto out_putmod;
    }

    ctlr = fcoe_ctlr_device_priv(ctlr_dev);
    fcoe = fcoe_ctlr_priv(ctlr);

    dev_hold(netdev);

    /*
     * Initialize FIP.
     */
    fcoe_ctlr_init(ctlr, fip_mode);
    ctlr->send = fcoe_fip_send;
    ctlr->update_mac = fcoe_update_src_mac;
    ctlr->get_src_addr = fcoe_get_src_mac;

    err = fcoe_interface_setup(fcoe, netdev);
    if (err) {
        fcoe_ctlr_destroy(ctlr);
        fcoe_ctlr_device_delete(ctlr_dev);
        dev_put(netdev);
        fcoe = ERR_PTR(err);
        goto out_putmod;
    }

    goto out;

out_putmod:
    module_put(THIS_MODULE);
out:
    return fcoe;
}

static void fcoe_interface_remove(struct fcoe_interface *fcoe)
{
    struct net_device *netdev = fcoe->netdev;
    struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
    u8 flogi_maddr[ETH_ALEN];
    const struct net_device_ops *ops;

    /*
     * Don't listen for Ethernet packets anymore.
     * synchronize_net() ensures that the packet handlers are not running
     * on another CPU. dev_remove_pack() would do that, this calls the
     * unsyncronized version __dev_remove_pack() to avoid multiple delays.
     */
    __dev_remove_pack(&fcoe->fcoe_packet_type);
    __dev_remove_pack(&fcoe->fip_packet_type);
    synchronize_net();

    /* Delete secondary MAC addresses */
    memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN);
    dev_uc_del(netdev, flogi_maddr);
    if (fip->spma)
        dev_uc_del(netdev, fip->ctl_src_addr);
    if (fip->mode == FIP_MODE_VN2VN) {
        dev_mc_del(netdev, FIP_ALL_VN2VN_MACS);
        dev_mc_del(netdev, FIP_ALL_P2P_MACS);
    } else
        dev_mc_del(netdev, FIP_ALL_ENODE_MACS);

    /* Tell the LLD we are done w/ FCoE */
    ops = netdev->netdev_ops;
    if (ops->ndo_fcoe_disable) {
        if (ops->ndo_fcoe_disable(netdev))
            FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE"
                    " specific feature for LLD.\n");
    }
    fcoe->removed = 1;
}


static void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
{
    struct net_device *netdev = fcoe->netdev;
    struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
    struct fcoe_ctlr_device *ctlr_dev = fcoe_ctlr_to_ctlr_dev(fip);

    rtnl_lock();
    if (!fcoe->removed)
        fcoe_interface_remove(fcoe);
    rtnl_unlock();

    /* Release the self-reference taken during fcoe_interface_create() */
    /* tear-down the FCoE controller */
    fcoe_ctlr_destroy(fip);
    scsi_host_put(fip->lp->host);
    fcoe_ctlr_device_delete(ctlr_dev);
    dev_put(netdev);
    module_put(THIS_MODULE);
}

static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *netdev,
             struct packet_type *ptype,
             struct net_device *orig_dev)
{
    struct fcoe_interface *fcoe;
    struct fcoe_ctlr *ctlr;

    fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type);
    ctlr = fcoe_to_ctlr(fcoe);
    fcoe_ctlr_recv(ctlr, skb);
    return 0;
}

static void fcoe_port_send(struct fcoe_port *port, struct sk_buff *skb)
{
    if (port->fcoe_pending_queue.qlen)
        fcoe_check_wait_queue(port->lport, skb);
    else if (fcoe_start_io(skb))
        fcoe_check_wait_queue(port->lport, skb);
}

static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
    skb->dev = fcoe_from_ctlr(fip)->netdev;
    fcoe_port_send(lport_priv(fip->lp), skb);
}

static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr)
{
    struct fcoe_port *port = lport_priv(lport);
    struct fcoe_interface *fcoe = port->priv;

    if (!is_zero_ether_addr(port->data_src_addr))
        dev_uc_del(fcoe->netdev, port->data_src_addr);
    if (!is_zero_ether_addr(addr))
        dev_uc_add(fcoe->netdev, addr);
    memcpy(port->data_src_addr, addr, ETH_ALEN);
}

static u8 *fcoe_get_src_mac(struct fc_lport *lport)
{
    struct fcoe_port *port = lport_priv(lport);

    return port->data_src_addr;
}

static int fcoe_lport_config(struct fc_lport *lport)
{
    lport->link_up = 0;
    lport->qfull = 0;
    lport->max_retry_count = 3;
    lport->max_rport_retry_count = 3;
    lport->e_d_tov = 2 * 1000;  /* FC-FS default */
    lport->r_a_tov = 2 * 2 * 1000;
    lport->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
                 FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
    lport->does_npiv = 1;

    fc_lport_init_stats(lport);

    /* lport fc_lport related configuration */
    fc_lport_config(lport);

    /* offload related configuration */
    lport->crc_offload = 0;
    lport->seq_offload = 0;
    lport->lro_enabled = 0;
    lport->lro_xid = 0;
    lport->lso_max = 0;

    return 0;
}

static void fcoe_netdev_features_change(struct fc_lport *lport,
                    struct net_device *netdev)
{
    mutex_lock(&lport->lp_mutex);

    if (netdev->features & NETIF_F_SG)
        lport->sg_supp = 1;
    else
        lport->sg_supp = 0;

    if (netdev->features & NETIF_F_FCOE_CRC) {
        lport->crc_offload = 1;
        FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n");
    } else {
        lport->crc_offload = 0;
    }

    if (netdev->features & NETIF_F_FSO) {
        lport->seq_offload = 1;
        lport->lso_max = netdev->gso_max_size;
        FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n",
                lport->lso_max);
    } else {
        lport->seq_offload = 0;
        lport->lso_max = 0;
    }

    if (netdev->fcoe_ddp_xid) {
        lport->lro_enabled = 1;
        lport->lro_xid = netdev->fcoe_ddp_xid;
        FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n",
                lport->lro_xid);
    } else {
        lport->lro_enabled = 0;
        lport->lro_xid = 0;
    }

    mutex_unlock(&lport->lp_mutex);
}

static int fcoe_netdev_config(struct fc_lport *lport, struct net_device *netdev)
{
    u32 mfs;
    u64 wwnn, wwpn;
    struct fcoe_interface *fcoe;
    struct fcoe_ctlr *ctlr;
    struct fcoe_port *port;

    /* Setup lport private data to point to fcoe softc */
    port = lport_priv(lport);
    fcoe = port->priv;
    ctlr = fcoe_to_ctlr(fcoe);

    /*
     * Determine max frame size based on underlying device and optional
     * user-configured limit.  If the MFS is too low, fcoe_link_ok()
     * will return 0, so do this first.
     */
    mfs = netdev->mtu;
    if (netdev->features & NETIF_F_FCOE_MTU) {
        mfs = FCOE_MTU;
        FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs);
    }
    mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof));
    if (fc_set_mfs(lport, mfs))
        return -EINVAL;

    /* offload features support */
    fcoe_netdev_features_change(lport, netdev);

    skb_queue_head_init(&port->fcoe_pending_queue);
    port->fcoe_pending_queue_active = 0;
    setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lport);

    fcoe_link_speed_update(lport);

    if (!lport->vport) {
        if (fcoe_get_wwn(netdev, &wwnn, NETDEV_FCOE_WWNN))
            wwnn = fcoe_wwn_from_mac(ctlr->ctl_src_addr, 1, 0);
        fc_set_wwnn(lport, wwnn);
        if (fcoe_get_wwn(netdev, &wwpn, NETDEV_FCOE_WWPN))
            wwpn = fcoe_wwn_from_mac(ctlr->ctl_src_addr,
                         2, 0);
        fc_set_wwpn(lport, wwpn);
    }

    return 0;
}

static int fcoe_shost_config(struct fc_lport *lport, struct device *dev)
{
    int rc = 0;

    /* lport scsi host config */
    lport->host->max_lun = FCOE_MAX_LUN;
    lport->host->max_id = FCOE_MAX_FCP_TARGET;
    lport->host->max_channel = 0;
    lport->host->max_cmd_len = FCOE_MAX_CMD_LEN;

    if (lport->vport)
        lport->host->transportt = fcoe_vport_scsi_transport;
    else
        lport->host->transportt = fcoe_nport_scsi_transport;

    /* add the new host to the SCSI-ml */
    rc = scsi_add_host(lport->host, dev);
    if (rc) {
        FCOE_NETDEV_DBG(fcoe_netdev(lport), "fcoe_shost_config: "
                "error on scsi_add_host\n");
        return rc;
    }

    if (!lport->vport)
        fc_host_max_npiv_vports(lport->host) = USHRT_MAX;

    snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
         "%s v%s over %s", FCOE_NAME, FCOE_VERSION,
         fcoe_netdev(lport)->name);

    return 0;
}


static void fcoe_fdmi_info(struct fc_lport *lport, struct net_device *netdev)
{
    struct fcoe_interface *fcoe;
    struct fcoe_port *port;
    struct net_device *realdev;
    int rc;
    struct netdev_fcoe_hbainfo fdmi;

    port = lport_priv(lport);
    fcoe = port->priv;
    realdev = fcoe->realdev;

    if (!realdev)
        return;

    /* No FDMI state m/c for NPIV ports */
    if (lport->vport)
        return;

    if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) {
        memset(&fdmi, 0, sizeof(fdmi));
        rc = realdev->netdev_ops->ndo_fcoe_get_hbainfo(realdev,
                                   &fdmi);
        if (rc) {
            printk(KERN_INFO "fcoe: Failed to retrieve FDMI "
                    "information from netdev.\n");
            return;
        }

        snprintf(fc_host_serial_number(lport->host),
             FC_SERIAL_NUMBER_SIZE,
             "%s",
             fdmi.serial_number);
        snprintf(fc_host_manufacturer(lport->host),
             FC_SERIAL_NUMBER_SIZE,
             "%s",
             fdmi.manufacturer);
        snprintf(fc_host_model(lport->host),
             FC_SYMBOLIC_NAME_SIZE,
             "%s",
             fdmi.model);
        snprintf(fc_host_model_description(lport->host),
             FC_SYMBOLIC_NAME_SIZE,
             "%s",
             fdmi.model_description);
        snprintf(fc_host_hardware_version(lport->host),
             FC_VERSION_STRING_SIZE,
             "%s",
             fdmi.hardware_version);
        snprintf(fc_host_driver_version(lport->host),
             FC_VERSION_STRING_SIZE,
             "%s",
             fdmi.driver_version);
        snprintf(fc_host_optionrom_version(lport->host),
             FC_VERSION_STRING_SIZE,
             "%s",
             fdmi.optionrom_version);
        snprintf(fc_host_firmware_version(lport->host),
             FC_VERSION_STRING_SIZE,
             "%s",
             fdmi.firmware_version);

        /* Enable FDMI lport states */
        lport->fdmi_enabled = 1;
    } else {
        lport->fdmi_enabled = 0;
        printk(KERN_INFO "fcoe: No FDMI support.\n");
    }
}

static bool fcoe_oem_match(struct fc_frame *fp)
{
    struct fc_frame_header *fh = fc_frame_header_get(fp);
    struct fcp_cmnd *fcp;

    if (fc_fcp_is_read(fr_fsp(fp)) &&
        (fr_fsp(fp)->data_len > fcoe_ddp_min))
        return true;
    else if ((fr_fsp(fp) == NULL) &&
         (fh->fh_r_ctl == FC_RCTL_DD_UNSOL_CMD) &&
         (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)) {
        fcp = fc_frame_payload_get(fp, sizeof(*fcp));
        if ((fcp->fc_flags & FCP_CFL_WRDATA) &&
            (ntohl(fcp->fc_dl) > fcoe_ddp_min))
            return true;
    }
    return false;
}

static inline int fcoe_em_config(struct fc_lport *lport)
{
    struct fcoe_port *port = lport_priv(lport);
    struct fcoe_interface *fcoe = port->priv;
    struct fcoe_interface *oldfcoe = NULL;
    struct net_device *old_real_dev, *cur_real_dev;
    u16 min_xid = FCOE_MIN_XID;
    u16 max_xid = FCOE_MAX_XID;

    /*
     * Check if need to allocate an em instance for
     * offload exchange ids to be shared across all VN_PORTs/lport.
     */
    if (!lport->lro_enabled || !lport->lro_xid ||
        (lport->lro_xid >= max_xid)) {
        lport->lro_xid = 0;
        goto skip_oem;
    }

    /*
     * Reuse existing offload em instance in case
     * it is already allocated on real eth device
     */
    if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
        cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
    else
        cur_real_dev = fcoe->netdev;

    list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
        if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
            old_real_dev = vlan_dev_real_dev(oldfcoe->netdev);
        else
            old_real_dev = oldfcoe->netdev;

        if (cur_real_dev == old_real_dev) {
            fcoe->oem = oldfcoe->oem;
            break;
        }
    }

    if (fcoe->oem) {
        if (!fc_exch_mgr_add(lport, fcoe->oem, fcoe_oem_match)) {
            printk(KERN_ERR "fcoe_em_config: failed to add "
                   "offload em:%p on interface:%s\n",
                   fcoe->oem, fcoe->netdev->name);
            return -ENOMEM;
        }
    } else {
        fcoe->oem = fc_exch_mgr_alloc(lport, FC_CLASS_3,
                          FCOE_MIN_XID, lport->lro_xid,
                          fcoe_oem_match);
        if (!fcoe->oem) {
            printk(KERN_ERR "fcoe_em_config: failed to allocate "
                   "em for offload exches on interface:%s\n",
                   fcoe->netdev->name);
            return -ENOMEM;
        }
    }

    /*
     * Exclude offload EM xid range from next EM xid range.
     */
    min_xid += lport->lro_xid + 1;

skip_oem:
    if (!fc_exch_mgr_alloc(lport, FC_CLASS_3, min_xid, max_xid, NULL)) {
        printk(KERN_ERR "fcoe_em_config: failed to "
               "allocate em on interface %s\n", fcoe->netdev->name);
        return -ENOMEM;
    }

    return 0;
}

static void fcoe_if_destroy(struct fc_lport *lport)
{
    struct fcoe_port *port = lport_priv(lport);
    struct fcoe_interface *fcoe = port->priv;
    struct net_device *netdev = fcoe->netdev;

    FCOE_NETDEV_DBG(netdev, "Destroying interface\n");

    /* Logout of the fabric */
    fc_fabric_logoff(lport);

    /* Cleanup the fc_lport */
    fc_lport_destroy(lport);

    /* Stop the transmit retry timer */
    del_timer_sync(&port->timer);

    /* Free existing transmit skbs */
    fcoe_clean_pending_queue(lport);

    rtnl_lock();
    if (!is_zero_ether_addr(port->data_src_addr))
        dev_uc_del(netdev, port->data_src_addr);
    if (lport->vport)
        synchronize_net();
    else
        fcoe_interface_remove(fcoe);
    rtnl_unlock();

    /* Free queued packets for the per-CPU receive threads */
    fcoe_percpu_clean(lport);

    /* Detach from the scsi-ml */
    fc_remove_host(lport->host);
    scsi_remove_host(lport->host);

    /* Destroy lport scsi_priv */
    fc_fcp_destroy(lport);

    /* There are no more rports or I/O, free the EM */
    fc_exch_mgr_free(lport);

    /* Free memory used by statistical counters */
    fc_lport_free_stats(lport);

    /*
     * Release the Scsi_Host for vport but hold on to
     * master lport until it fcoe interface fully cleaned-up.
     */
    if (lport->vport)
        scsi_host_put(lport->host);
}

static int fcoe_ddp_setup(struct fc_lport *lport, u16 xid,
              struct scatterlist *sgl, unsigned int sgc)
{
    struct net_device *netdev = fcoe_netdev(lport);

    if (netdev->netdev_ops->ndo_fcoe_ddp_setup)
        return netdev->netdev_ops->ndo_fcoe_ddp_setup(netdev,
                                  xid, sgl,
                                  sgc);

    return 0;
}

static int fcoe_ddp_target(struct fc_lport *lport, u16 xid,
               struct scatterlist *sgl, unsigned int sgc)
{
    struct net_device *netdev = fcoe_netdev(lport);

    if (netdev->netdev_ops->ndo_fcoe_ddp_target)
        return netdev->netdev_ops->ndo_fcoe_ddp_target(netdev, xid,
                                   sgl, sgc);

    return 0;
}


static int fcoe_ddp_done(struct fc_lport *lport, u16 xid)
{
    struct net_device *netdev = fcoe_netdev(lport);

    if (netdev->netdev_ops->ndo_fcoe_ddp_done)
        return netdev->netdev_ops->ndo_fcoe_ddp_done(netdev, xid);
    return 0;
}

static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe,
                       struct device *parent, int npiv)
{
    struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
    struct net_device *netdev = fcoe->netdev;
    struct fc_lport *lport, *n_port;
    struct fcoe_port *port;
    struct Scsi_Host *shost;
    int rc;
    /*
     * parent is only a vport if npiv is 1,
     * but we'll only use vport in that case so go ahead and set it
     */
    struct fc_vport *vport = dev_to_vport(parent);

    FCOE_NETDEV_DBG(netdev, "Create Interface\n");

    if (!npiv)
        lport = libfc_host_alloc(&fcoe_shost_template, sizeof(*port));
    else
        lport = libfc_vport_create(vport, sizeof(*port));

    if (!lport) {
        FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n");
        rc = -ENOMEM;
        goto out;
    }
    port = lport_priv(lport);
    port->lport = lport;
    port->priv = fcoe;
    port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH;
    port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH;
    INIT_WORK(&port->destroy_work, fcoe_destroy_work);

    /* configure a fc_lport including the exchange manager */
    rc = fcoe_lport_config(lport);
    if (rc) {
        FCOE_NETDEV_DBG(netdev, "Could not configure lport for the "
                "interface\n");
        goto out_host_put;
    }

    if (npiv) {
        FCOE_NETDEV_DBG(netdev, "Setting vport names, "
                "%16.16llx %16.16llx\n",
                vport->node_name, vport->port_name);
        fc_set_wwnn(lport, vport->node_name);
        fc_set_wwpn(lport, vport->port_name);
    }

    /* configure lport network properties */
    rc = fcoe_netdev_config(lport, netdev);
    if (rc) {
        FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the "
                "interface\n");
        goto out_lp_destroy;
    }

    /* configure lport scsi host properties */
    rc = fcoe_shost_config(lport, parent);
    if (rc) {
        FCOE_NETDEV_DBG(netdev, "Could not configure shost for the "
                "interface\n");
        goto out_lp_destroy;
    }

    /* Initialize the library */
    rc = fcoe_libfc_config(lport, ctlr, &fcoe_libfc_fcn_templ, 1);
    if (rc) {
        FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the "
                "interface\n");
        goto out_lp_destroy;
    }

    /* Initialized FDMI information */
    fcoe_fdmi_info(lport, netdev);

    /*
     * fcoe_em_alloc() and fcoe_hostlist_add() both
     * need to be atomic with respect to other changes to the
     * hostlist since fcoe_em_alloc() looks for an existing EM
     * instance on host list updated by fcoe_hostlist_add().
     *
     * This is currently handled through the fcoe_config_mutex
     * begin held.
     */
    if (!npiv)
        /* lport exch manager allocation */
        rc = fcoe_em_config(lport);
    else {
        shost = vport_to_shost(vport);
        n_port = shost_priv(shost);
        rc = fc_exch_mgr_list_clone(n_port, lport);
    }

    if (rc) {
        FCOE_NETDEV_DBG(netdev, "Could not configure the EM\n");
        goto out_lp_destroy;
    }

    return lport;

out_lp_destroy:
    fc_exch_mgr_free(lport);
out_host_put:
    scsi_host_put(lport->host);
out:
    return ERR_PTR(rc);
}

static int __init fcoe_if_init(void)
{
    /* attach to scsi transport */
    fcoe_nport_scsi_transport =
        fc_attach_transport(&fcoe_nport_fc_functions);
    fcoe_vport_scsi_transport =
        fc_attach_transport(&fcoe_vport_fc_functions);

    if (!fcoe_nport_scsi_transport) {
        printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
        return -ENODEV;
    }

    return 0;
}

static int __exit fcoe_if_exit(void)
{
    fc_release_transport(fcoe_nport_scsi_transport);
    fc_release_transport(fcoe_vport_scsi_transport);
    fcoe_nport_scsi_transport = NULL;
    fcoe_vport_scsi_transport = NULL;
    return 0;
}

static void fcoe_percpu_thread_create(unsigned int cpu)
{
    struct fcoe_percpu_s *p;
    struct task_struct *thread;

    p = &per_cpu(fcoe_percpu, cpu);

    thread = kthread_create_on_node(fcoe_percpu_receive_thread,
                    (void *)p, cpu_to_node(cpu),
                    "fcoethread/%d", cpu);

    if (likely(!IS_ERR(thread))) {
        kthread_bind(thread, cpu);
        wake_up_process(thread);

        spin_lock_bh(&p->fcoe_rx_list.lock);
        p->thread = thread;
        spin_unlock_bh(&p->fcoe_rx_list.lock);
    }
}

static void fcoe_percpu_thread_destroy(unsigned int cpu)
{
    struct fcoe_percpu_s *p;
    struct task_struct *thread;
    struct page *crc_eof;
    struct sk_buff *skb;
#ifdef CONFIG_SMP
    struct fcoe_percpu_s *p0;
    unsigned targ_cpu = get_cpu();
#endif /* CONFIG_SMP */

    FCOE_DBG("Destroying receive thread for CPU %d\n", cpu);

    /* Prevent any new skbs from being queued for this CPU. */
    p = &per_cpu(fcoe_percpu, cpu);
    spin_lock_bh(&p->fcoe_rx_list.lock);
    thread = p->thread;
    p->thread = NULL;
    crc_eof = p->crc_eof_page;
    p->crc_eof_page = NULL;
    p->crc_eof_offset = 0;
    spin_unlock_bh(&p->fcoe_rx_list.lock);

#ifdef CONFIG_SMP
    /*
     * Don't bother moving the skb's if this context is running
     * on the same CPU that is having its thread destroyed. This
     * can easily happen when the module is removed.
     */
    if (cpu != targ_cpu) {
        p0 = &per_cpu(fcoe_percpu, targ_cpu);
        spin_lock_bh(&p0->fcoe_rx_list.lock);
        if (p0->thread) {
            FCOE_DBG("Moving frames from CPU %d to CPU %d\n",
                 cpu, targ_cpu);

            while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
                __skb_queue_tail(&p0->fcoe_rx_list, skb);
            spin_unlock_bh(&p0->fcoe_rx_list.lock);
        } else {
            /*
             * The targeted CPU is not initialized and cannot accept
             * new  skbs. Unlock the targeted CPU and drop the skbs
             * on the CPU that is going offline.
             */
            while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
                kfree_skb(skb);
            spin_unlock_bh(&p0->fcoe_rx_list.lock);
        }
    } else {
        /*
         * This scenario occurs when the module is being removed
         * and all threads are being destroyed. skbs will continue
         * to be shifted from the CPU thread that is being removed
         * to the CPU thread associated with the CPU that is processing
         * the module removal. Once there is only one CPU Rx thread it
         * will reach this case and we will drop all skbs and later
         * stop the thread.
         */
        spin_lock_bh(&p->fcoe_rx_list.lock);
        while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
            kfree_skb(skb);
        spin_unlock_bh(&p->fcoe_rx_list.lock);
    }
    put_cpu();
#else
    /*
     * This a non-SMP scenario where the singular Rx thread is
     * being removed. Free all skbs and stop the thread.
     */
    spin_lock_bh(&p->fcoe_rx_list.lock);
    while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
        kfree_skb(skb);
    spin_unlock_bh(&p->fcoe_rx_list.lock);
#endif

    if (thread)
        kthread_stop(thread);

    if (crc_eof)
        put_page(crc_eof);
}

static int fcoe_cpu_callback(struct notifier_block *nfb,
                 unsigned long action, void *hcpu)
{
    unsigned cpu = (unsigned long)hcpu;

    switch (action) {
    case CPU_ONLINE:
    case CPU_ONLINE_FROZEN:
        FCOE_DBG("CPU %x online: Create Rx thread\n", cpu);
        fcoe_percpu_thread_create(cpu);
        break;
    case CPU_DEAD:
    case CPU_DEAD_FROZEN:
        FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu);
        fcoe_percpu_thread_destroy(cpu);
        break;
    default:
        break;
    }
    return NOTIFY_OK;
}

static inline unsigned int fcoe_select_cpu(void)
{
    static unsigned int selected_cpu;

    selected_cpu = cpumask_next(selected_cpu, cpu_online_mask);
    if (selected_cpu >= nr_cpu_ids)
        selected_cpu = cpumask_first(cpu_online_mask);

    return selected_cpu;
}

static int fcoe_rcv(struct sk_buff *skb, struct net_device *netdev,
         struct packet_type *ptype, struct net_device *olddev)
{
    struct fc_lport *lport;
    struct fcoe_rcv_info *fr;
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;
    struct fc_frame_header *fh;
    struct fcoe_percpu_s *fps;
    struct ethhdr *eh;
    unsigned int cpu;

    fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type);
    ctlr = fcoe_to_ctlr(fcoe);
    lport = ctlr->lp;
    if (unlikely(!lport)) {
        FCOE_NETDEV_DBG(netdev, "Cannot find hba structure");
        goto err2;
    }
    if (!lport->link_up)
        goto err2;

    FCOE_NETDEV_DBG(netdev, "skb_info: len:%d data_len:%d head:%p "
            "data:%p tail:%p end:%p sum:%d dev:%s",
            skb->len, skb->data_len, skb->head, skb->data,
            skb_tail_pointer(skb), skb_end_pointer(skb),
            skb->csum, skb->dev ? skb->dev->name : "<NULL>");

    eh = eth_hdr(skb);

    if (is_fip_mode(ctlr) &&
        compare_ether_addr(eh->h_source, ctlr->dest_addr)) {
        FCOE_NETDEV_DBG(netdev, "wrong source mac address:%pM\n",
                eh->h_source);
        goto err;
    }

    /*
     * Check for minimum frame length, and make sure required FCoE
     * and FC headers are pulled into the linear data area.
     */
    if (unlikely((skb->len < FCOE_MIN_FRAME) ||
             !pskb_may_pull(skb, FCOE_HEADER_LEN)))
        goto err;

    skb_set_transport_header(skb, sizeof(struct fcoe_hdr));
    fh = (struct fc_frame_header *) skb_transport_header(skb);

    if (ntoh24(&eh->h_dest[3]) != ntoh24(fh->fh_d_id)) {
        FCOE_NETDEV_DBG(netdev, "FC frame d_id mismatch with MAC:%pM\n",
                eh->h_dest);
        goto err;
    }

    fr = fcoe_dev_from_skb(skb);
    fr->fr_dev = lport;

    /*
     * In case the incoming frame's exchange is originated from
     * the initiator, then received frame's exchange id is ANDed
     * with fc_cpu_mask bits to get the same cpu on which exchange
     * was originated, otherwise select cpu using rx exchange id
     * or fcoe_select_cpu().
     */
    if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX)
        cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask;
    else {
        if (ntohs(fh->fh_rx_id) == FC_XID_UNKNOWN)
            cpu = fcoe_select_cpu();
        else
            cpu = ntohs(fh->fh_rx_id) & fc_cpu_mask;
    }

    if (cpu >= nr_cpu_ids)
        goto err;

    fps = &per_cpu(fcoe_percpu, cpu);
    spin_lock(&fps->fcoe_rx_list.lock);
    if (unlikely(!fps->thread)) {
        /*
         * The targeted CPU is not ready, let's target
         * the first CPU now. For non-SMP systems this
         * will check the same CPU twice.
         */
        FCOE_NETDEV_DBG(netdev, "CPU is online, but no receive thread "
                "ready for incoming skb- using first online "
                "CPU.\n");

        spin_unlock(&fps->fcoe_rx_list.lock);
        cpu = cpumask_first(cpu_online_mask);
        fps = &per_cpu(fcoe_percpu, cpu);
        spin_lock(&fps->fcoe_rx_list.lock);
        if (!fps->thread) {
            spin_unlock(&fps->fcoe_rx_list.lock);
            goto err;
        }
    }

    /*
     * We now have a valid CPU that we're targeting for
     * this skb. We also have this receive thread locked,
     * so we're free to queue skbs into it's queue.
     */

    /*
     * Note: We used to have a set of conditions under which we would
     * call fcoe_recv_frame directly, rather than queuing to the rx list
     * as it could save a few cycles, but doing so is prohibited, as
     * fcoe_recv_frame has several paths that may sleep, which is forbidden
     * in softirq context.
     */
    __skb_queue_tail(&fps->fcoe_rx_list, skb);
    if (fps->thread->state == TASK_INTERRUPTIBLE)
        wake_up_process(fps->thread);
    spin_unlock(&fps->fcoe_rx_list.lock);

    return 0;
err:
    per_cpu_ptr(lport->stats, get_cpu())->ErrorFrames++;
    put_cpu();
err2:
    kfree_skb(skb);
    return -1;
}

static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
{
    struct fcoe_percpu_s *fps;
    int rc;

    fps = &get_cpu_var(fcoe_percpu);
    rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
    put_cpu_var(fcoe_percpu);

    return rc;
}

static int fcoe_xmit(struct fc_lport *lport, struct fc_frame *fp)
{
    int wlen;
    u32 crc;
    struct ethhdr *eh;
    struct fcoe_crc_eof *cp;
    struct sk_buff *skb;
    struct fc_stats *stats;
    struct fc_frame_header *fh;
    unsigned int hlen;      /* header length implies the version */
    unsigned int tlen;      /* trailer length */
    unsigned int elen;      /* eth header, may include vlan */
    struct fcoe_port *port = lport_priv(lport);
    struct fcoe_interface *fcoe = port->priv;
    struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
    u8 sof, eof;
    struct fcoe_hdr *hp;

    WARN_ON((fr_len(fp) % sizeof(u32)) != 0);

    fh = fc_frame_header_get(fp);
    skb = fp_skb(fp);
    wlen = skb->len / FCOE_WORD_TO_BYTE;

    if (!lport->link_up) {
        kfree_skb(skb);
        return 0;
    }

    if (unlikely(fh->fh_type == FC_TYPE_ELS) &&
        fcoe_ctlr_els_send(ctlr, lport, skb))
        return 0;

    sof = fr_sof(fp);
    eof = fr_eof(fp);

    elen = sizeof(struct ethhdr);
    hlen = sizeof(struct fcoe_hdr);
    tlen = sizeof(struct fcoe_crc_eof);
    wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;

    /* crc offload */
    if (likely(lport->crc_offload)) {
        skb->ip_summed = CHECKSUM_UNNECESSARY;
        skb->csum_start = skb_headroom(skb);
        skb->csum_offset = skb->len;
        crc = 0;
    } else {
        skb->ip_summed = CHECKSUM_NONE;
        crc = fcoe_fc_crc(fp);
    }

    /* copy port crc and eof to the skb buff */
    if (skb_is_nonlinear(skb)) {
        skb_frag_t *frag;
        if (fcoe_alloc_paged_crc_eof(skb, tlen)) {
            kfree_skb(skb);
            return -ENOMEM;
        }
        frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
        cp = kmap_atomic(skb_frag_page(frag))
            + frag->page_offset;
    } else {
        cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
    }

    memset(cp, 0, sizeof(*cp));
    cp->fcoe_eof = eof;
    cp->fcoe_crc32 = cpu_to_le32(~crc);

    if (skb_is_nonlinear(skb)) {
        kunmap_atomic(cp);
        cp = NULL;
    }

    /* adjust skb network/transport offsets to match mac/fcoe/port */
    skb_push(skb, elen + hlen);
    skb_reset_mac_header(skb);
    skb_reset_network_header(skb);
    skb->mac_len = elen;
    skb->protocol = htons(ETH_P_FCOE);
    skb->priority = fcoe->priority;

    if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN &&
        fcoe->realdev->features & NETIF_F_HW_VLAN_TX) {
        skb->vlan_tci = VLAN_TAG_PRESENT |
                vlan_dev_vlan_id(fcoe->netdev);
        skb->dev = fcoe->realdev;
    } else
        skb->dev = fcoe->netdev;

    /* fill up mac and fcoe headers */
    eh = eth_hdr(skb);
    eh->h_proto = htons(ETH_P_FCOE);
    memcpy(eh->h_dest, ctlr->dest_addr, ETH_ALEN);
    if (ctlr->map_dest)
        memcpy(eh->h_dest + 3, fh->fh_d_id, 3);

    if (unlikely(ctlr->flogi_oxid != FC_XID_UNKNOWN))
        memcpy(eh->h_source, ctlr->ctl_src_addr, ETH_ALEN);
    else
        memcpy(eh->h_source, port->data_src_addr, ETH_ALEN);

    hp = (struct fcoe_hdr *)(eh + 1);
    memset(hp, 0, sizeof(*hp));
    if (FC_FCOE_VER)
        FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
    hp->fcoe_sof = sof;

    /* fcoe lso, mss is in max_payload which is non-zero for FCP data */
    if (lport->seq_offload && fr_max_payload(fp)) {
        skb_shinfo(skb)->gso_type = SKB_GSO_FCOE;
        skb_shinfo(skb)->gso_size = fr_max_payload(fp);
    } else {
        skb_shinfo(skb)->gso_type = 0;
        skb_shinfo(skb)->gso_size = 0;
    }
    /* update tx stats: regardless if LLD fails */
    stats = per_cpu_ptr(lport->stats, get_cpu());
    stats->TxFrames++;
    stats->TxWords += wlen;
    put_cpu();

    /* send down to lld */
    fr_dev(fp) = lport;
    fcoe_port_send(port, skb);
    return 0;
}

static void fcoe_percpu_flush_done(struct sk_buff *skb)
{
    complete(&fcoe_flush_completion);
}

static inline int fcoe_filter_frames(struct fc_lport *lport,
                     struct fc_frame *fp)
{
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;
    struct fc_frame_header *fh;
    struct sk_buff *skb = (struct sk_buff *)fp;
    struct fc_stats *stats;

    /*
     * We only check CRC if no offload is available and if it is
     * it's solicited data, in which case, the FCP layer would
     * check it during the copy.
     */
    if (lport->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY)
        fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
    else
        fr_flags(fp) |= FCPHF_CRC_UNCHECKED;

    fh = (struct fc_frame_header *) skb_transport_header(skb);
    fh = fc_frame_header_get(fp);
    if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && fh->fh_type == FC_TYPE_FCP)
        return 0;

    fcoe = ((struct fcoe_port *)lport_priv(lport))->priv;
    ctlr = fcoe_to_ctlr(fcoe);
    if (is_fip_mode(ctlr) && fc_frame_payload_op(fp) == ELS_LOGO &&
        ntoh24(fh->fh_s_id) == FC_FID_FLOGI) {
        FCOE_DBG("fcoe: dropping FCoE lport LOGO in fip mode\n");
        return -EINVAL;
    }

    if (!(fr_flags(fp) & FCPHF_CRC_UNCHECKED) ||
        le32_to_cpu(fr_crc(fp)) == ~crc32(~0, skb->data, skb->len)) {
        fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
        return 0;
    }

    stats = per_cpu_ptr(lport->stats, get_cpu());
    stats->InvalidCRCCount++;
    if (stats->InvalidCRCCount < 5)
        printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
    put_cpu();
    return -EINVAL;
}

static void fcoe_recv_frame(struct sk_buff *skb)
{
    u32 fr_len;
    struct fc_lport *lport;
    struct fcoe_rcv_info *fr;
    struct fc_stats *stats;
    struct fcoe_crc_eof crc_eof;
    struct fc_frame *fp;
    struct fcoe_port *port;
    struct fcoe_hdr *hp;

    fr = fcoe_dev_from_skb(skb);
    lport = fr->fr_dev;
    if (unlikely(!lport)) {
        if (skb->destructor != fcoe_percpu_flush_done)
            FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb");
        kfree_skb(skb);
        return;
    }

    FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d "
            "head:%p data:%p tail:%p end:%p sum:%d dev:%s",
            skb->len, skb->data_len,
            skb->head, skb->data, skb_tail_pointer(skb),
            skb_end_pointer(skb), skb->csum,
            skb->dev ? skb->dev->name : "<NULL>");

    port = lport_priv(lport);
    skb_linearize(skb); /* check for skb_is_nonlinear is within skb_linearize */

    /*
     * Frame length checks and setting up the header pointers
     * was done in fcoe_rcv already.
     */
    hp = (struct fcoe_hdr *) skb_network_header(skb);

    stats = per_cpu_ptr(lport->stats, get_cpu());
    if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
        if (stats->ErrorFrames < 5)
            printk(KERN_WARNING "fcoe: FCoE version "
                   "mismatch: The frame has "
                   "version %x, but the "
                   "initiator supports version "
                   "%x\n", FC_FCOE_DECAPS_VER(hp),
                   FC_FCOE_VER);
        goto drop;
    }

    skb_pull(skb, sizeof(struct fcoe_hdr));
    fr_len = skb->len - sizeof(struct fcoe_crc_eof);

    stats->RxFrames++;
    stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;

    fp = (struct fc_frame *)skb;
    fc_frame_init(fp);
    fr_dev(fp) = lport;
    fr_sof(fp) = hp->fcoe_sof;

    /* Copy out the CRC and EOF trailer for access */
    if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof)))
        goto drop;
    fr_eof(fp) = crc_eof.fcoe_eof;
    fr_crc(fp) = crc_eof.fcoe_crc32;
    if (pskb_trim(skb, fr_len))
        goto drop;

    if (!fcoe_filter_frames(lport, fp)) {
        put_cpu();
        fc_exch_recv(lport, fp);
        return;
    }
drop:
    stats->ErrorFrames++;
    put_cpu();
    kfree_skb(skb);
}

static int fcoe_percpu_receive_thread(void *arg)
{
    struct fcoe_percpu_s *p = arg;
    struct sk_buff *skb;
    struct sk_buff_head tmp;

    skb_queue_head_init(&tmp);

    set_user_nice(current, -20);

retry:
    while (!kthread_should_stop()) {

        spin_lock_bh(&p->fcoe_rx_list.lock);
        skb_queue_splice_init(&p->fcoe_rx_list, &tmp);

        if (!skb_queue_len(&tmp)) {
            set_current_state(TASK_INTERRUPTIBLE);
            spin_unlock_bh(&p->fcoe_rx_list.lock);
            schedule();
            set_current_state(TASK_RUNNING);
            goto retry;
        }

        spin_unlock_bh(&p->fcoe_rx_list.lock);

        while ((skb = __skb_dequeue(&tmp)) != NULL)
            fcoe_recv_frame(skb);

    }
    return 0;
}

static void fcoe_dev_setup(void)
{
    register_dcbevent_notifier(&dcb_notifier);
    register_netdevice_notifier(&fcoe_notifier);
}

static void fcoe_dev_cleanup(void)
{
    unregister_dcbevent_notifier(&dcb_notifier);
    unregister_netdevice_notifier(&fcoe_notifier);
}

static struct fcoe_interface *
fcoe_hostlist_lookup_realdev_port(struct net_device *netdev)
{
    struct fcoe_interface *fcoe;
    struct net_device *real_dev;

    list_for_each_entry(fcoe, &fcoe_hostlist, list) {
        if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN)
            real_dev = vlan_dev_real_dev(fcoe->netdev);
        else
            real_dev = fcoe->netdev;

        if (netdev == real_dev)
            return fcoe;
    }
    return NULL;
}

static int fcoe_dcb_app_notification(struct notifier_block *notifier,
                     ulong event, void *ptr)
{
    struct dcb_app_type *entry = ptr;
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;
    struct net_device *netdev;
    int prio;

    if (entry->app.selector != DCB_APP_IDTYPE_ETHTYPE)
        return NOTIFY_OK;

    netdev = dev_get_by_index(&init_net, entry->ifindex);
    if (!netdev)
        return NOTIFY_OK;

    fcoe = fcoe_hostlist_lookup_realdev_port(netdev);
    dev_put(netdev);
    if (!fcoe)
        return NOTIFY_OK;

    ctlr = fcoe_to_ctlr(fcoe);

    if (entry->dcbx & DCB_CAP_DCBX_VER_CEE)
        prio = ffs(entry->app.priority) - 1;
    else
        prio = entry->app.priority;

    if (prio < 0)
        return NOTIFY_OK;

    if (entry->app.protocol == ETH_P_FIP ||
        entry->app.protocol == ETH_P_FCOE)
        ctlr->priority = prio;

    if (entry->app.protocol == ETH_P_FCOE)
        fcoe->priority = prio;

    return NOTIFY_OK;
}

static int fcoe_device_notification(struct notifier_block *notifier,
                    ulong event, void *ptr)
{
    struct fc_lport *lport = NULL;
    struct net_device *netdev = ptr;
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;
    struct fcoe_port *port;
    struct fc_stats *stats;
    u32 link_possible = 1;
    u32 mfs;
    int rc = NOTIFY_OK;

    list_for_each_entry(fcoe, &fcoe_hostlist, list) {
        if (fcoe->netdev == netdev) {
            ctlr = fcoe_to_ctlr(fcoe);
            lport = ctlr->lp;
            break;
        }
    }
    if (!lport) {
        rc = NOTIFY_DONE;
        goto out;
    }

    switch (event) {
    case NETDEV_DOWN:
    case NETDEV_GOING_DOWN:
        link_possible = 0;
        break;
    case NETDEV_UP:
    case NETDEV_CHANGE:
        break;
    case NETDEV_CHANGEMTU:
        if (netdev->features & NETIF_F_FCOE_MTU)
            break;
        mfs = netdev->mtu - (sizeof(struct fcoe_hdr) +
                     sizeof(struct fcoe_crc_eof));
        if (mfs >= FC_MIN_MAX_FRAME)
            fc_set_mfs(lport, mfs);
        break;
    case NETDEV_REGISTER:
        break;
    case NETDEV_UNREGISTER:
        list_del(&fcoe->list);
        port = lport_priv(ctlr->lp);
        queue_work(fcoe_wq, &port->destroy_work);
        goto out;
        break;
    case NETDEV_FEAT_CHANGE:
        fcoe_netdev_features_change(lport, netdev);
        break;
    default:
        FCOE_NETDEV_DBG(netdev, "Unknown event %ld "
                "from netdev netlink\n", event);
    }

    fcoe_link_speed_update(lport);

    if (link_possible && !fcoe_link_ok(lport))
        fcoe_ctlr_link_up(ctlr);
    else if (fcoe_ctlr_link_down(ctlr)) {
        stats = per_cpu_ptr(lport->stats, get_cpu());
        stats->LinkFailureCount++;
        put_cpu();
        fcoe_clean_pending_queue(lport);
    }
out:
    return rc;
}

static int fcoe_disable(struct net_device *netdev)
{
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;
    int rc = 0;

    mutex_lock(&fcoe_config_mutex);

    rtnl_lock();
    fcoe = fcoe_hostlist_lookup_port(netdev);
    rtnl_unlock();

    if (fcoe) {
        ctlr = fcoe_to_ctlr(fcoe);
        fcoe_ctlr_link_down(ctlr);
        fcoe_clean_pending_queue(ctlr->lp);
    } else
        rc = -ENODEV;

    mutex_unlock(&fcoe_config_mutex);
    return rc;
}

static int fcoe_enable(struct net_device *netdev)
{
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;
    int rc = 0;

    mutex_lock(&fcoe_config_mutex);
    rtnl_lock();
    fcoe = fcoe_hostlist_lookup_port(netdev);
    rtnl_unlock();

    if (!fcoe) {
        rc = -ENODEV;
        goto out;
    }

    ctlr = fcoe_to_ctlr(fcoe);

    if (!fcoe_link_ok(ctlr->lp))
        fcoe_ctlr_link_up(ctlr);

out:
    mutex_unlock(&fcoe_config_mutex);
    return rc;
}

static int fcoe_destroy(struct net_device *netdev)
{
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;
    struct fc_lport *lport;
    struct fcoe_port *port;
    int rc = 0;

    mutex_lock(&fcoe_config_mutex);
    rtnl_lock();
    fcoe = fcoe_hostlist_lookup_port(netdev);
    if (!fcoe) {
        rc = -ENODEV;
        goto out_nodev;
    }
    ctlr = fcoe_to_ctlr(fcoe);
    lport = ctlr->lp;
    port = lport_priv(lport);
    list_del(&fcoe->list);
    queue_work(fcoe_wq, &port->destroy_work);
out_nodev:
    rtnl_unlock();
    mutex_unlock(&fcoe_config_mutex);
    return rc;
}

static void fcoe_destroy_work(struct work_struct *work)
{
    struct fcoe_port *port;
    struct fcoe_interface *fcoe;

    port = container_of(work, struct fcoe_port, destroy_work);
    mutex_lock(&fcoe_config_mutex);

    fcoe = port->priv;
    fcoe_if_destroy(port->lport);
    fcoe_interface_cleanup(fcoe);

    mutex_unlock(&fcoe_config_mutex);
}

static bool fcoe_match(struct net_device *netdev)
{
    return true;
}

static void fcoe_dcb_create(struct fcoe_interface *fcoe)
{
#ifdef CONFIG_DCB
    int dcbx;
    u8 fup, up;
    struct net_device *netdev = fcoe->realdev;
    struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
    struct dcb_app app = {
                .priority = 0,
                .protocol = ETH_P_FCOE
                 };

    /* setup DCB priority attributes. */
    if (netdev && netdev->dcbnl_ops && netdev->dcbnl_ops->getdcbx) {
        dcbx = netdev->dcbnl_ops->getdcbx(netdev);

        if (dcbx & DCB_CAP_DCBX_VER_IEEE) {
            app.selector = IEEE_8021QAZ_APP_SEL_ETHERTYPE;
            up = dcb_ieee_getapp_mask(netdev, &app);
            app.protocol = ETH_P_FIP;
            fup = dcb_ieee_getapp_mask(netdev, &app);
        } else {
            app.selector = DCB_APP_IDTYPE_ETHTYPE;
            up = dcb_getapp(netdev, &app);
            app.protocol = ETH_P_FIP;
            fup = dcb_getapp(netdev, &app);
        }

        fcoe->priority = ffs(up) ? ffs(up) - 1 : 0;
        ctlr->priority = ffs(fup) ? ffs(fup) - 1 : fcoe->priority;
    }
#endif
}

static int fcoe_create(struct net_device *netdev, enum fip_state fip_mode)
{
    int rc = 0;
    struct fcoe_ctlr_device *ctlr_dev;
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;
    struct fc_lport *lport;

    mutex_lock(&fcoe_config_mutex);
    rtnl_lock();

    /* look for existing lport */
    if (fcoe_hostlist_lookup(netdev)) {
        rc = -EEXIST;
        goto out_nodev;
    }

    fcoe = fcoe_interface_create(netdev, fip_mode);
    if (IS_ERR(fcoe)) {
        rc = PTR_ERR(fcoe);
        goto out_nodev;
    }

    ctlr = fcoe_to_ctlr(fcoe);
    ctlr_dev = fcoe_ctlr_to_ctlr_dev(ctlr);
    lport = fcoe_if_create(fcoe, &ctlr_dev->dev, 0);
    if (IS_ERR(lport)) {
        printk(KERN_ERR "fcoe: Failed to create interface (%s)\n",
               netdev->name);
        rc = -EIO;
        rtnl_unlock();
        fcoe_interface_cleanup(fcoe);
        goto out_nortnl;
    }

    /* Make this the "master" N_Port */
    ctlr->lp = lport;

    /* setup DCB priority attributes. */
    fcoe_dcb_create(fcoe);

    /* add to lports list */
    fcoe_hostlist_add(lport);

    /* start FIP Discovery and FLOGI */
    lport->boot_time = jiffies;
    fc_fabric_login(lport);
    if (!fcoe_link_ok(lport)) {
        rtnl_unlock();
        fcoe_ctlr_link_up(ctlr);
        mutex_unlock(&fcoe_config_mutex);
        return rc;
    }

out_nodev:
    rtnl_unlock();
out_nortnl:
    mutex_unlock(&fcoe_config_mutex);
    return rc;
}

static int fcoe_link_speed_update(struct fc_lport *lport)
{
    struct net_device *netdev = fcoe_netdev(lport);
    struct ethtool_cmd ecmd;

    if (!__ethtool_get_settings(netdev, &ecmd)) {
        lport->link_supported_speeds &=
            ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
        if (ecmd.supported & (SUPPORTED_1000baseT_Half |
                      SUPPORTED_1000baseT_Full))
            lport->link_supported_speeds |= FC_PORTSPEED_1GBIT;
        if (ecmd.supported & SUPPORTED_10000baseT_Full)
            lport->link_supported_speeds |=
                FC_PORTSPEED_10GBIT;
        switch (ethtool_cmd_speed(&ecmd)) {
        case SPEED_1000:
            lport->link_speed = FC_PORTSPEED_1GBIT;
            break;
        case SPEED_10000:
            lport->link_speed = FC_PORTSPEED_10GBIT;
            break;
        }
        return 0;
    }
    return -1;
}

static int fcoe_link_ok(struct fc_lport *lport)
{
    struct net_device *netdev = fcoe_netdev(lport);

    if (netif_oper_up(netdev))
        return 0;
    return -1;
}

static void fcoe_percpu_clean(struct fc_lport *lport)
{
    struct fcoe_percpu_s *pp;
    struct sk_buff *skb;
    unsigned int cpu;

    for_each_possible_cpu(cpu) {
        pp = &per_cpu(fcoe_percpu, cpu);

        if (!pp->thread || !cpu_online(cpu))
            continue;

        skb = dev_alloc_skb(0);
        if (!skb)
            continue;

        skb->destructor = fcoe_percpu_flush_done;

        spin_lock_bh(&pp->fcoe_rx_list.lock);
        __skb_queue_tail(&pp->fcoe_rx_list, skb);
        if (pp->fcoe_rx_list.qlen == 1)
            wake_up_process(pp->thread);
        spin_unlock_bh(&pp->fcoe_rx_list.lock);

        wait_for_completion(&fcoe_flush_completion);
    }
}

static int fcoe_reset(struct Scsi_Host *shost)
{
    struct fc_lport *lport = shost_priv(shost);
    struct fcoe_port *port = lport_priv(lport);
    struct fcoe_interface *fcoe = port->priv;
    struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);

    fcoe_ctlr_link_down(ctlr);
    fcoe_clean_pending_queue(ctlr->lp);
    if (!fcoe_link_ok(ctlr->lp))
        fcoe_ctlr_link_up(ctlr);
    return 0;
}

static struct fcoe_interface *
fcoe_hostlist_lookup_port(const struct net_device *netdev)
{
    struct fcoe_interface *fcoe;

    list_for_each_entry(fcoe, &fcoe_hostlist, list) {
        if (fcoe->netdev == netdev)
            return fcoe;
    }
    return NULL;
}

static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev)
{
    struct fcoe_ctlr *ctlr;
    struct fcoe_interface *fcoe;

    fcoe = fcoe_hostlist_lookup_port(netdev);
    ctlr = fcoe_to_ctlr(fcoe);
    return (fcoe) ? ctlr->lp : NULL;
}

static int fcoe_hostlist_add(const struct fc_lport *lport)
{
    struct fcoe_interface *fcoe;
    struct fcoe_port *port;

    fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport));
    if (!fcoe) {
        port = lport_priv(lport);
        fcoe = port->priv;
        list_add_tail(&fcoe->list, &fcoe_hostlist);
    }
    return 0;
}


static struct fcoe_transport fcoe_sw_transport = {
    .name = {FCOE_TRANSPORT_DEFAULT},
    .attached = false,
    .list = LIST_HEAD_INIT(fcoe_sw_transport.list),
    .match = fcoe_match,
    .create = fcoe_create,
    .destroy = fcoe_destroy,
    .enable = fcoe_enable,
    .disable = fcoe_disable,
};

static int __init fcoe_init(void)
{
    struct fcoe_percpu_s *p;
    unsigned int cpu;
    int rc = 0;

    fcoe_wq = alloc_workqueue("fcoe", 0, 0);
    if (!fcoe_wq)
        return -ENOMEM;

    /* register as a fcoe transport */
    rc = fcoe_transport_attach(&fcoe_sw_transport);
    if (rc) {
        printk(KERN_ERR "failed to register an fcoe transport, check "
            "if libfcoe is loaded\n");
        return rc;
    }

    mutex_lock(&fcoe_config_mutex);

    for_each_possible_cpu(cpu) {
        p = &per_cpu(fcoe_percpu, cpu);
        skb_queue_head_init(&p->fcoe_rx_list);
    }

    for_each_online_cpu(cpu)
        fcoe_percpu_thread_create(cpu);

    /* Initialize per CPU interrupt thread */
    rc = register_hotcpu_notifier(&fcoe_cpu_notifier);
    if (rc)
        goto out_free;

    /* Setup link change notification */
    fcoe_dev_setup();

    rc = fcoe_if_init();
    if (rc)
        goto out_free;

    mutex_unlock(&fcoe_config_mutex);
    return 0;

out_free:
    for_each_online_cpu(cpu) {
        fcoe_percpu_thread_destroy(cpu);
    }
    mutex_unlock(&fcoe_config_mutex);
    destroy_workqueue(fcoe_wq);
    return rc;
}
module_init(fcoe_init);

static void __exit fcoe_exit(void)
{
    struct fcoe_interface *fcoe, *tmp;
    struct fcoe_ctlr *ctlr;
    struct fcoe_port *port;
    unsigned int cpu;

    mutex_lock(&fcoe_config_mutex);

    fcoe_dev_cleanup();

    /* releases the associated fcoe hosts */
    rtnl_lock();
    list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) {
        list_del(&fcoe->list);
        ctlr = fcoe_to_ctlr(fcoe);
        port = lport_priv(ctlr->lp);
        queue_work(fcoe_wq, &port->destroy_work);
    }
    rtnl_unlock();

    unregister_hotcpu_notifier(&fcoe_cpu_notifier);

    for_each_online_cpu(cpu)
        fcoe_percpu_thread_destroy(cpu);

    mutex_unlock(&fcoe_config_mutex);

    /*
     * destroy_work's may be chained but destroy_workqueue()
     * can take care of them. Just kill the fcoe_wq.
     */
    destroy_workqueue(fcoe_wq);

    /*
     * Detaching from the scsi transport must happen after all
     * destroys are done on the fcoe_wq. destroy_workqueue will
     * enusre the fcoe_wq is flushed.
     */
    fcoe_if_exit();

    /* detach from fcoe transport */
    fcoe_transport_detach(&fcoe_sw_transport);
}
module_exit(fcoe_exit);

static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
{
    struct fcoe_ctlr *fip = arg;
    struct fc_exch *exch = fc_seq_exch(seq);
    struct fc_lport *lport = exch->lp;
    u8 *mac;

    if (IS_ERR(fp))
        goto done;

    mac = fr_cb(fp)->granted_mac;
    /* pre-FIP */
    if (is_zero_ether_addr(mac))
        fcoe_ctlr_recv_flogi(fip, lport, fp);
    if (!is_zero_ether_addr(mac))
        fcoe_update_src_mac(lport, mac);
done:
    fc_lport_flogi_resp(seq, fp, lport);
}

static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg)
{
    struct fc_lport *lport = arg;
    static u8 zero_mac[ETH_ALEN] = { 0 };

    if (!IS_ERR(fp))
        fcoe_update_src_mac(lport, zero_mac);
    fc_lport_logo_resp(seq, fp, lport);
}

static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, u32 did,
                      struct fc_frame *fp, unsigned int op,
                      void (*resp)(struct fc_seq *,
                           struct fc_frame *,
                           void *),
                      void *arg, u32 timeout)
{
    struct fcoe_port *port = lport_priv(lport);
    struct fcoe_interface *fcoe = port->priv;
    struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
    struct fc_frame_header *fh = fc_frame_header_get(fp);

    switch (op) {
    case ELS_FLOGI:
    case ELS_FDISC:
        if (lport->point_to_multipoint)
            break;
        return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp,
                     fip, timeout);
    case ELS_LOGO:
        /* only hook onto fabric logouts, not port logouts */
        if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI)
            break;
        return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp,
                     lport, timeout);
    }
    return fc_elsct_send(lport, did, fp, op, resp, arg, timeout);
}

static int fcoe_vport_create(struct fc_vport *vport, bool disabled)
{
    struct Scsi_Host *shost = vport_to_shost(vport);
    struct fc_lport *n_port = shost_priv(shost);
    struct fcoe_port *port = lport_priv(n_port);
    struct fcoe_interface *fcoe = port->priv;
    struct net_device *netdev = fcoe->netdev;
    struct fc_lport *vn_port;
    int rc;
    char buf[32];

    rc = fcoe_validate_vport_create(vport);
    if (rc) {
        fcoe_wwn_to_str(vport->port_name, buf, sizeof(buf));
        printk(KERN_ERR "fcoe: Failed to create vport, "
            "WWPN (0x%s) already exists\n",
            buf);
        return rc;
    }

    mutex_lock(&fcoe_config_mutex);
    rtnl_lock();
    vn_port = fcoe_if_create(fcoe, &vport->dev, 1);
    rtnl_unlock();
    mutex_unlock(&fcoe_config_mutex);

    if (IS_ERR(vn_port)) {
        printk(KERN_ERR "fcoe: fcoe_vport_create(%s) failed\n",
               netdev->name);
        return -EIO;
    }

    if (disabled) {
        fc_vport_set_state(vport, FC_VPORT_DISABLED);
    } else {
        vn_port->boot_time = jiffies;
        fc_fabric_login(vn_port);
        fc_vport_setlink(vn_port);
    }
    return 0;
}

static int fcoe_vport_destroy(struct fc_vport *vport)
{
    struct Scsi_Host *shost = vport_to_shost(vport);
    struct fc_lport *n_port = shost_priv(shost);
    struct fc_lport *vn_port = vport->dd_data;

    mutex_lock(&n_port->lp_mutex);
    list_del(&vn_port->list);
    mutex_unlock(&n_port->lp_mutex);

    mutex_lock(&fcoe_config_mutex);
    fcoe_if_destroy(vn_port);
    mutex_unlock(&fcoe_config_mutex);

    return 0;
}

static int fcoe_vport_disable(struct fc_vport *vport, bool disable)
{
    struct fc_lport *lport = vport->dd_data;

    if (disable) {
        fc_vport_set_state(vport, FC_VPORT_DISABLED);
        fc_fabric_logoff(lport);
    } else {
        lport->boot_time = jiffies;
        fc_fabric_login(lport);
        fc_vport_setlink(lport);
    }

    return 0;
}

static void fcoe_set_vport_symbolic_name(struct fc_vport *vport)
{
    struct fc_lport *lport = vport->dd_data;
    struct fc_frame *fp;
    size_t len;

    snprintf(fc_host_symbolic_name(lport->host), FC_SYMBOLIC_NAME_SIZE,
         "%s v%s over %s : %s", FCOE_NAME, FCOE_VERSION,
         fcoe_netdev(lport)->name, vport->symbolic_name);

    if (lport->state != LPORT_ST_READY)
        return;

    len = strnlen(fc_host_symbolic_name(lport->host), 255);
    fp = fc_frame_alloc(lport,
                sizeof(struct fc_ct_hdr) +
                sizeof(struct fc_ns_rspn) + len);
    if (!fp)
        return;
    lport->tt.elsct_send(lport, FC_FID_DIR_SERV, fp, FC_NS_RSPN_ID,
                 NULL, NULL, 3 * lport->r_a_tov);
}

static void fcoe_get_lesb(struct fc_lport *lport,
             struct fc_els_lesb *fc_lesb)
{
    struct net_device *netdev = fcoe_netdev(lport);

    __fcoe_get_lesb(lport, fc_lesb, netdev);
}

static void fcoe_ctlr_get_lesb(struct fcoe_ctlr_device *ctlr_dev)
{
    struct fcoe_ctlr *fip = fcoe_ctlr_device_priv(ctlr_dev);
    struct net_device *netdev = fcoe_netdev(fip->lp);
    struct fcoe_fc_els_lesb *fcoe_lesb;
    struct fc_els_lesb fc_lesb;

    __fcoe_get_lesb(fip->lp, &fc_lesb, netdev);
    fcoe_lesb = (struct fcoe_fc_els_lesb *)(&fc_lesb);

    ctlr_dev->lesb.lesb_link_fail =
        ntohl(fcoe_lesb->lesb_link_fail);
    ctlr_dev->lesb.lesb_vlink_fail =
        ntohl(fcoe_lesb->lesb_vlink_fail);
    ctlr_dev->lesb.lesb_miss_fka =
        ntohl(fcoe_lesb->lesb_miss_fka);
    ctlr_dev->lesb.lesb_symb_err =
        ntohl(fcoe_lesb->lesb_symb_err);
    ctlr_dev->lesb.lesb_err_block =
        ntohl(fcoe_lesb->lesb_err_block);
    ctlr_dev->lesb.lesb_fcs_error =
        ntohl(fcoe_lesb->lesb_fcs_error);
}

static void fcoe_fcf_get_vlan_id(struct fcoe_fcf_device *fcf_dev)
{
    struct fcoe_ctlr_device *ctlr_dev =
        fcoe_fcf_dev_to_ctlr_dev(fcf_dev);
    struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
    struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);

    fcf_dev->vlan_id = vlan_dev_vlan_id(fcoe->netdev);
}

static void fcoe_set_port_id(struct fc_lport *lport,
                 u32 port_id, struct fc_frame *fp)
{
    struct fcoe_port *port = lport_priv(lport);
    struct fcoe_interface *fcoe = port->priv;
    struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);

    if (fp && fc_frame_payload_op(fp) == ELS_FLOGI)
        fcoe_ctlr_recv_flogi(ctlr, lport, fp);
}