// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
 *
 * 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 unsigned int fcoe_e_d_tov = 2 * 1000;
module_param_named(e_d_tov, fcoe_e_d_tov, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(e_d_tov, "E_D_TOV in ms, default 2000");

static unsigned int fcoe_r_a_tov = 2 * 2 * 1000;
module_param_named(r_a_tov, fcoe_r_a_tov, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(r_a_tov, "R_A_TOV in ms, default 4000");

static DEFINE_MUTEX(fcoe_config_mutex);

static struct workqueue_struct *fcoe_wq;

/* 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 void fcoe_percpu_clean(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 void fcoe_hostlist_del(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 int fcoe_fip_vlan_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_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_mode 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);

/* fcoe_syfs control interface handlers */
static int fcoe_ctlr_alloc(struct net_device *netdev);
static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev);
static void fcoe_ctlr_mode(struct fcoe_ctlr_device *ctlr_dev);

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);

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

/* 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_fcf_get_vlan_id(struct fcoe_fcf_device *);
static void fcoe_vport_remove(struct fc_lport *);

static struct fcoe_sysfs_function_template fcoe_sysfs_templ = {
        .set_fcoe_ctlr_mode = fcoe_ctlr_mode,
        .set_fcoe_ctlr_enabled = fcoe_ctlr_enabled,
        .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 const struct scsi_host_template fcoe_shost_template = {
        .module = THIS_MODULE,
        .name = "FCoE Driver",
        .proc_name = FCOE_NAME,
        .queuecommand = fc_queuecommand,
        .eh_timed_out = fc_eh_timed_out,
        .eh_abort_handler = fc_eh_abort,
        .eh_device_reset_handler = fc_eh_device_reset,
        .eh_host_reset_handler = fc_eh_host_reset,
        .sdev_init = fc_sdev_init,
        .change_queue_depth = scsi_change_queue_depth,
        .this_id = -1,
        .cmd_per_lun = 3,
        .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
        .sg_tablesize = SG_ALL,
        .max_sectors = 0xffff,
        .track_queue_depth = 1,
        .cmd_size = sizeof(struct libfc_cmd_priv),
};

/**
 * fcoe_interface_setup() - Setup a FCoE interface
 * @fcoe:   The new FCoE interface
 * @netdev: The net device that the fcoe interface is on
 *
 * Returns : 0 for success
 * Locking: must be called with the RTNL mutex held
 */
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;
        static const u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
        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 (netif_is_bond_master(netdev)) {
                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 = is_vlan_dev(netdev) ? 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.
         */
        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 = 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);

        if (netdev != real_dev) {
                fcoe->fip_vlan_packet_type.func = fcoe_fip_vlan_recv;
                fcoe->fip_vlan_packet_type.type = htons(ETH_P_FIP);
                fcoe->fip_vlan_packet_type.dev = real_dev;
                dev_add_pack(&fcoe->fip_vlan_packet_type);
        }
        return 0;
}

/**
 * fcoe_interface_create() - Create a FCoE interface on a net device
 * @netdev: The net device to create the FCoE interface on
 * @fip_mode: The mode to use for FIP
 *
 * Returns: pointer to a struct fcoe_interface or NULL on error
 */
static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev,
                                                    enum fip_mode 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);
        ctlr->cdev = 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;
}

/**
 * fcoe_interface_remove() - remove FCoE interface from netdev
 * @fcoe: The FCoE interface to be cleaned up
 *
 * Caller must be holding the RTNL mutex
 */
static void fcoe_interface_remove(struct fcoe_interface *fcoe)
{
        struct net_device *netdev = fcoe->netdev;
        struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);
        static const u8 flogi_maddr[ETH_ALEN] = FC_FCOE_FLOGI_MAC;
        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);
        if (netdev != fcoe->realdev)
                __dev_remove_pack(&fcoe->fip_vlan_packet_type);
        synchronize_net();

        /* Delete secondary MAC addresses */
        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;
}


/**
 * fcoe_interface_cleanup() - Clean up a FCoE interface
 * @fcoe: The FCoE interface to be cleaned up
 */
static void fcoe_interface_cleanup(struct fcoe_interface *fcoe)
{
        struct net_device *netdev = fcoe->netdev;
        struct fcoe_ctlr *fip = fcoe_to_ctlr(fcoe);

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

/**
 * fcoe_fip_recv() - Handler for received FIP frames
 * @skb:      The receive skb
 * @netdev:   The associated net device
 * @ptype:    The packet_type structure which was used to register this handler
 * @orig_dev: The original net_device the skb was received on.
 *            (in case dev is a bond)
 *
 * Returns: 0 for success
 */
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;
}

/**
 * fcoe_fip_vlan_recv() - Handler for received FIP VLAN discovery frames
 * @skb:      The receive skb
 * @netdev:   The associated net device
 * @ptype:    The packet_type structure which was used to register this handler
 * @orig_dev: The original net_device the skb was received on.
 *            (in case dev is a bond)
 *
 * Returns: 0 for success
 */
static int fcoe_fip_vlan_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_vlan_packet_type);
        ctlr = fcoe_to_ctlr(fcoe);
        fcoe_ctlr_recv(ctlr, skb);
        return 0;
}

/**
 * fcoe_port_send() - Send an Ethernet-encapsulated FIP/FCoE frame
 * @port: The FCoE port
 * @skb: The FIP/FCoE packet to be sent
 */
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);
}

/**
 * fcoe_fip_send() - Send an Ethernet-encapsulated FIP frame
 * @fip: The FCoE controller
 * @skb: The FIP packet to be sent
 */
static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb)
{
        struct fcoe_interface *fcoe = fcoe_from_ctlr(fip);
        struct fip_frame {
                struct ethhdr eth;
                struct fip_header fip;
        } __packed *frame;

        /*
         * Use default VLAN for FIP VLAN discovery protocol
         */
        frame = (struct fip_frame *)skb->data;
        if (ntohs(frame->eth.h_proto) == ETH_P_FIP &&
            ntohs(frame->fip.fip_op) == FIP_OP_VLAN &&
            fcoe->realdev != fcoe->netdev)
                skb->dev = fcoe->realdev;
        else
                skb->dev = fcoe->netdev;
        fcoe_port_send(lport_priv(fip->lp), skb);
}

/**
 * fcoe_update_src_mac() - Update the Ethernet MAC filters
 * @lport: The local port to update the source MAC on
 * @addr:  Unicast MAC address to add
 *
 * Remove any previously-set unicast MAC filter.
 * Add secondary FCoE MAC address filter for our OUI.
 */
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);
}

/**
 * fcoe_get_src_mac() - return the Ethernet source address for an lport
 * @lport: libfc lport
 */
static u8 *fcoe_get_src_mac(struct fc_lport *lport)
{
        struct fcoe_port *port = lport_priv(lport);

        return port->data_src_addr;
}

/**
 * fcoe_lport_config() - Set up a local port
 * @lport: The local port to be setup
 *
 * Returns: 0 for success
 */
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 = fcoe_e_d_tov;
        lport->r_a_tov = fcoe_r_a_tov;
        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;
}

/*
 * fcoe_netdev_features_change - Updates the lport's offload flags based
 * on the LLD netdev's FCoE feature flags
 */
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 = min(netdev->gso_max_size, GSO_LEGACY_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);
}

/**
 * fcoe_netdev_config() - Set up net devive for SW FCoE
 * @lport:  The local port that is associated with the net device
 * @netdev: The associated net device
 *
 * Must be called after fcoe_lport_config() as it will use local port mutex
 *
 * Returns: 0 for success
 */
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);

        /* Figure out the VLAN ID, if any */
        if (is_vlan_dev(netdev))
                lport->vlan = vlan_dev_vlan_id(netdev);
        else
                lport->vlan = 0;

        /*
         * 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->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;
        timer_setup(&port->timer, fcoe_queue_timer, 0);

        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;
}

/**
 * fcoe_shost_config() - Set up the SCSI host associated with a local port
 * @lport: The local port
 * @dev:   The device associated with the SCSI host
 *
 * Must be called after fcoe_lport_config() and fcoe_netdev_config()
 *
 * Returns: 0 for success
 */
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;
}


/**
 * fcoe_fdmi_info() - Get FDMI related info from net devive for SW FCoE
 * @lport:  The local port that is associated with the net device
 * @netdev: The associated net device
 *
 * Must be called after fcoe_shost_config() as it will use local port mutex
 *
 */
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;

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

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

        if (realdev->netdev_ops->ndo_fcoe_get_hbainfo) {
                struct netdev_fcoe_hbainfo *fdmi;
                fdmi = kzalloc_obj(*fdmi);
                if (!fdmi)
                        return;

                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;
                kfree(fdmi);
        } else {
                lport->fdmi_enabled = 0;
                printk(KERN_INFO "fcoe: No FDMI support.\n");
        }
}

/**
 * fcoe_oem_match() - The match routine for the offloaded exchange manager
 * @fp: The I/O frame
 *
 * This routine will be associated with an exchange manager (EM). When
 * the libfc exchange handling code is looking for an EM to use it will
 * call this routine and pass it the frame that it wishes to send. This
 * routine will return True if the associated EM is to be used and False
 * if the echange code should continue looking for an EM.
 *
 * The offload EM that this routine is associated with will handle any
 * packets that are for SCSI read requests.
 *
 * This has been enhanced to work when FCoE stack is operating in target
 * mode.
 *
 * Returns: True for read types I/O, otherwise returns false.
 */
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;
}

/**
 * fcoe_em_config() - Allocate and configure an exchange manager
 * @lport: The local port that the new EM will be associated with
 *
 * Returns: 0 on success
 */
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 (is_vlan_dev(fcoe->netdev))
                cur_real_dev = vlan_dev_real_dev(fcoe->netdev);
        else
                cur_real_dev = fcoe->netdev;

        list_for_each_entry(oldfcoe, &fcoe_hostlist, list) {
                if (is_vlan_dev(oldfcoe->netdev))
                        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;
}

/**
 * fcoe_if_destroy() - Tear down a SW FCoE instance
 * @lport: The local port to be destroyed
 *
 * Locking: Must be called with the RTNL mutex held.
 *
 */
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 */
        timer_delete_sync(&port->timer);

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

        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);

        /* 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);
}

/**
 * fcoe_ddp_setup() - Call a LLD's ddp_setup through the net device
 * @lport: The local port to setup DDP for
 * @xid:   The exchange ID for this DDP transfer
 * @sgl:   The scatterlist describing this transfer
 * @sgc:   The number of sg items
 *
 * Returns: 0 if the DDP context was not configured
 */
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;
}

/**
 * fcoe_ddp_target() - Call a LLD's ddp_target through the net device
 * @lport: The local port to setup DDP for
 * @xid:   The exchange ID for this DDP transfer
 * @sgl:   The scatterlist describing this transfer
 * @sgc:   The number of sg items
 *
 * Returns: 0 if the DDP context was not configured
 */
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;
}


/**
 * fcoe_ddp_done() - Call a LLD's ddp_done through the net device
 * @lport: The local port to complete DDP on
 * @xid:   The exchange ID for this DDP transfer
 *
 * Returns: the length of data that have been completed by DDP
 */
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;
}

/**
 * fcoe_if_create() - Create a FCoE instance on an interface
 * @fcoe:   The FCoE interface to create a local port on
 * @parent: The device pointer to be the parent in sysfs for the SCSI host
 * @npiv:   Indicates if the port is a vport or not
 *
 * Creates a fc_lport instance and a Scsi_Host instance and configure them.
 *
 * Returns: The allocated fc_lport or an error pointer
 */
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->get_netdev = fcoe_netdev;
        port->max_queue_depth = FCOE_MAX_QUEUE_DEPTH;
        port->min_queue_depth = FCOE_MIN_QUEUE_DEPTH;
        INIT_WORK(&port->destroy_work, fcoe_destroy_work);

        /*
         * Need to add the lport to the hostlist
         * so we catch NETDEV_CHANGE events.
         */
        fcoe_hostlist_add(lport);

        /* 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:
        fcoe_hostlist_del(lport);
        scsi_host_put(lport->host);
out:
        return ERR_PTR(rc);
}

/**
 * fcoe_if_init() - Initialization routine for fcoe.ko
 *
 * Attaches the SW FCoE transport to the FC transport
 *
 * Returns: 0 on success
 */
static int __init fcoe_if_init(void)
{
        /* attach to scsi transport */
        fcoe_nport_scsi_transport =
                fc_attach_transport(&fcoe_nport_fc_functions);
        if (!fcoe_nport_scsi_transport)
                goto err;

        fcoe_vport_scsi_transport =
                fc_attach_transport(&fcoe_vport_fc_functions);
        if (!fcoe_vport_scsi_transport)
                goto err_vport;

        return 0;

err_vport:
        fc_release_transport(fcoe_nport_scsi_transport);
err:
        printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n");
        return -ENODEV;
}

/**
 * fcoe_if_exit() - Tear down fcoe.ko
 *
 * Detaches the SW FCoE transport from the FC transport
 *
 * Returns: 0 on success
 */
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_thread_cleanup_local(unsigned int cpu)
{
        struct page *crc_eof;
        struct fcoe_percpu_s *p;

        p = per_cpu_ptr(&fcoe_percpu, cpu);
        spin_lock_bh(&p->fcoe_rx_list.lock);
        crc_eof = p->crc_eof_page;
        p->crc_eof_page = NULL;
        p->crc_eof_offset = 0;
        spin_unlock_bh(&p->fcoe_rx_list.lock);

        if (crc_eof)
                put_page(crc_eof);
        flush_work(&p->work);
}

/**
 * fcoe_rcv() - Receive packets from a net device
 * @skb:    The received packet
 * @netdev: The net device that the packet was received on
 * @ptype:  The packet type context
 * @olddev: The last device net device
 *
 * This routine is called by NET_RX_SOFTIRQ. It receives a packet, builds a
 * FC frame and passes the frame to libfc.
 *
 * Returns: 0 for success
 */
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\n");
                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\n",
                        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>");


        skb = skb_share_check(skb, GFP_ATOMIC);

        if (skb == NULL)
                return NET_RX_DROP;

        eh = eth_hdr(skb);

        if (is_fip_mode(ctlr) &&
            !ether_addr_equal(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 = skb->alloc_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);
        /*
         * 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);
        schedule_work_on(cpu, &fps->work);
        spin_unlock(&fps->fcoe_rx_list.lock);

        return NET_RX_SUCCESS;
err:
        this_cpu_inc(lport->stats->ErrorFrames);
err2:
        kfree_skb(skb);
        return NET_RX_DROP;
}

/**
 * fcoe_alloc_paged_crc_eof() - Allocate a page to be used for the trailer CRC
 * @skb:  The packet to be transmitted
 * @tlen: The total length of the trailer
 *
 * Returns: 0 for success
 */
static int fcoe_alloc_paged_crc_eof(struct sk_buff *skb, int tlen)
{
        struct fcoe_percpu_s *fps;
        int rc;

        local_lock(&fcoe_percpu.lock);
        fps = this_cpu_ptr(&fcoe_percpu);
        rc = fcoe_get_paged_crc_eof(skb, tlen, fps);
        local_unlock(&fcoe_percpu.lock);

        return rc;
}

/**
 * fcoe_xmit() - Transmit a FCoE frame
 * @lport: The local port that the frame is to be transmitted for
 * @fp:    The frame to be transmitted
 *
 * Return: 0 for success
 */
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_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);

        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_PARTIAL;
                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)) + skb_frag_off(frag);
        } else {
                cp = 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 (is_vlan_dev(fcoe->netdev) &&
            fcoe->realdev->features & NETIF_F_HW_VLAN_CTAG_TX) {
                /* must set skb->dev before calling vlan_put_tag */
                skb->dev = fcoe->realdev;
                __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
                                       vlan_dev_vlan_id(fcoe->netdev));
        } 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 */
        this_cpu_inc(lport->stats->TxFrames);
        this_cpu_add(lport->stats->TxWords, wlen);

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

/**
 * fcoe_filter_frames() - filter out bad fcoe frames, i.e. bad CRC
 * @lport: The local port the frame was received on
 * @fp:    The received frame
 *
 * Return: 0 on passing filtering checks
 */
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;

        /*
         * 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 = 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;
        }

        if (this_cpu_inc_return(lport->stats->InvalidCRCCount) < 5)
                printk(KERN_WARNING "fcoe: dropping frame with CRC error\n");
        return -EINVAL;
}

/**
 * fcoe_recv_frame() - process a single received frame
 * @skb: frame to process
 */
static void fcoe_recv_frame(struct sk_buff *skb)
{
        u32 fr_len;
        struct fc_lport *lport;
        struct fcoe_rcv_info *fr;
        struct fcoe_crc_eof crc_eof;
        struct fc_frame *fp;
        struct fcoe_hdr *hp;

        fr = fcoe_dev_from_skb(skb);
        lport = fr->fr_dev;
        if (unlikely(!lport)) {
                FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb\n");
                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\n",
                        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>");

        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);

        if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
                struct fc_stats *stats;

                stats = per_cpu_ptr(lport->stats, raw_smp_processor_id());
                if (READ_ONCE(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);

        this_cpu_inc(lport->stats->RxFrames);
        this_cpu_add(lport->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)) {
                fc_exch_recv(lport, fp);
                return;
        }
drop:
        this_cpu_inc(lport->stats->ErrorFrames);
        kfree_skb(skb);
}

/**
 * fcoe_receive_work() - The per-CPU worker
 * @work: The work struct
 *
 */
static void fcoe_receive_work(struct work_struct *work)
{
        struct fcoe_percpu_s *p;
        struct sk_buff *skb;
        struct sk_buff_head tmp;

        p = container_of(work, struct fcoe_percpu_s, work);
        skb_queue_head_init(&tmp);

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

        if (!skb_queue_len(&tmp))
                return;

        while ((skb = __skb_dequeue(&tmp)))
                fcoe_recv_frame(skb);
}

/**
 * fcoe_dev_setup() - Setup the link change notification interface
 */
static void fcoe_dev_setup(void)
{
        register_dcbevent_notifier(&dcb_notifier);
        register_netdevice_notifier(&fcoe_notifier);
}

/**
 * fcoe_dev_cleanup() - Cleanup the link change notification interface
 */
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 (is_vlan_dev(fcoe->netdev))
                        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;
}

/**
 * fcoe_device_notification() - Handler for net device events
 * @notifier: The context of the notification
 * @event:    The type of event
 * @ptr:      The net device that the event was on
 *
 * This function is called by the Ethernet driver in case of link change event.
 *
 * Returns: 0 for success
 */
static int fcoe_device_notification(struct notifier_block *notifier,
                                    ulong event, void *ptr)
{
        struct fcoe_ctlr_device *cdev;
        struct fc_lport *lport = NULL;
        struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
        struct fcoe_ctlr *ctlr;
        struct fcoe_interface *fcoe;
        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->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);
                fcoe_vport_remove(lport);
                mutex_lock(&fcoe_config_mutex);
                fcoe_if_destroy(lport);
                if (!fcoe->removed)
                        fcoe_interface_remove(fcoe);
                fcoe_interface_cleanup(fcoe);
                mutex_unlock(&fcoe_config_mutex);
                fcoe_ctlr_device_delete(fcoe_ctlr_to_ctlr_dev(ctlr));
                goto out;
        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);

        cdev = fcoe_ctlr_to_ctlr_dev(ctlr);

        if (link_possible && !fcoe_link_ok(lport)) {
                switch (cdev->enabled) {
                case FCOE_CTLR_DISABLED:
                        pr_info("Link up while interface is disabled.\n");
                        break;
                case FCOE_CTLR_ENABLED:
                case FCOE_CTLR_UNUSED:
                        fcoe_ctlr_link_up(ctlr);
                }
        } else if (fcoe_ctlr_link_down(ctlr)) {
                switch (cdev->enabled) {
                case FCOE_CTLR_DISABLED:
                        pr_info("Link down while interface is disabled.\n");
                        break;
                case FCOE_CTLR_ENABLED:
                case FCOE_CTLR_UNUSED:
                        this_cpu_inc(lport->stats->LinkFailureCount);
                        fcoe_clean_pending_queue(lport);
                }
        }
out:
        return rc;
}

/**
 * fcoe_disable() - Disables a FCoE interface
 * @netdev  : The net_device object the Ethernet interface to create on
 *
 * Called from fcoe transport.
 *
 * Returns: 0 for success
 *
 * Deprecated: use fcoe_ctlr_enabled()
 */
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;
}

/**
 * fcoe_enable() - Enables a FCoE interface
 * @netdev  : The net_device object the Ethernet interface to create on
 *
 * Called from fcoe transport.
 *
 * Returns: 0 for success
 */
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;
}

/**
 * fcoe_ctlr_enabled() - Enable or disable an FCoE Controller
 * @cdev: The FCoE Controller that is being enabled or disabled
 *
 * fcoe_sysfs will ensure that the state of 'enabled' has
 * changed, so no checking is necessary here. This routine simply
 * calls fcoe_enable or fcoe_disable, both of which are deprecated.
 * When those routines are removed the functionality can be merged
 * here.
 */
static int fcoe_ctlr_enabled(struct fcoe_ctlr_device *cdev)
{
        struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(cdev);
        struct fc_lport *lport = ctlr->lp;
        struct net_device *netdev = fcoe_netdev(lport);

        switch (cdev->enabled) {
        case FCOE_CTLR_ENABLED:
                return fcoe_enable(netdev);
        case FCOE_CTLR_DISABLED:
                return fcoe_disable(netdev);
        case FCOE_CTLR_UNUSED:
        default:
                return -ENOTSUPP;
        }
}

/**
 * fcoe_ctlr_mode() - Switch FIP mode
 * @ctlr_dev: The FCoE Controller that is being modified
 *
 * When the FIP mode has been changed we need to update
 * the multicast addresses to ensure we get the correct
 * frames.
 */
static void fcoe_ctlr_mode(struct fcoe_ctlr_device *ctlr_dev)
{
        struct fcoe_ctlr *ctlr = fcoe_ctlr_device_priv(ctlr_dev);
        struct fcoe_interface *fcoe = fcoe_ctlr_priv(ctlr);

        if (ctlr_dev->mode == FIP_CONN_TYPE_VN2VN &&
            ctlr->mode != FIP_MODE_VN2VN) {
                dev_mc_del(fcoe->netdev, FIP_ALL_ENODE_MACS);
                dev_mc_add(fcoe->netdev, FIP_ALL_VN2VN_MACS);
                dev_mc_add(fcoe->netdev, FIP_ALL_P2P_MACS);
        } else if (ctlr->mode != FIP_MODE_FABRIC) {
                dev_mc_del(fcoe->netdev, FIP_ALL_VN2VN_MACS);
                dev_mc_del(fcoe->netdev, FIP_ALL_P2P_MACS);
                dev_mc_add(fcoe->netdev, FIP_ALL_ENODE_MACS);
        }
        fcoe_ctlr_set_fip_mode(ctlr_dev);
}

/**
 * fcoe_destroy() - Destroy a FCoE interface
 * @netdev  : The net_device object the Ethernet interface to create on
 *
 * Called from fcoe transport
 *
 * Returns: 0 for success
 */
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;
}

/**
 * fcoe_destroy_work() - Destroy a FCoE port in a deferred work context
 * @work: Handle to the FCoE port to be destroyed
 */
static void fcoe_destroy_work(struct work_struct *work)
{
        struct fcoe_ctlr_device *cdev;
        struct fcoe_ctlr *ctlr;
        struct fcoe_port *port;
        struct fcoe_interface *fcoe;

        port = container_of(work, struct fcoe_port, destroy_work);

        fcoe_vport_remove(port->lport);

        mutex_lock(&fcoe_config_mutex);

        fcoe = port->priv;
        ctlr = fcoe_to_ctlr(fcoe);
        cdev = fcoe_ctlr_to_ctlr_dev(ctlr);

        rtnl_lock();
        fcoe_if_destroy(port->lport);
        if (!fcoe->removed)
                fcoe_interface_remove(fcoe);
        rtnl_unlock();
        fcoe_interface_cleanup(fcoe);

        mutex_unlock(&fcoe_config_mutex);

        fcoe_ctlr_device_delete(cdev);
}

/**
 * fcoe_match() - Check if the FCoE is supported on the given netdevice
 * @netdev  : The net_device object the Ethernet interface to create on
 *
 * Called from fcoe transport.
 *
 * Returns: always returns true as this is the default FCoE transport,
 * i.e., support all netdevs.
 */
static bool fcoe_match(struct net_device *netdev)
{
        return true;
}

/**
 * fcoe_dcb_create() - Initialize DCB attributes and hooks
 * @fcoe:   The new FCoE interface
 */
static void fcoe_dcb_create(struct fcoe_interface *fcoe)
{
        int ctlr_prio = TC_PRIO_BESTEFFORT;
        int fcoe_prio = TC_PRIO_INTERACTIVE;
        struct fcoe_ctlr *ctlr = fcoe_to_ctlr(fcoe);
#ifdef CONFIG_DCB
        int dcbx;
        u8 fup, up;
        struct net_device *netdev = fcoe->realdev;
        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_prio = ffs(up) ? ffs(up) - 1 : 0;
                ctlr_prio = ffs(fup) ? ffs(fup) - 1 : fcoe_prio;
        }
#endif
        fcoe->priority = fcoe_prio;
        ctlr->priority = ctlr_prio;
}

enum fcoe_create_link_state {
        FCOE_CREATE_LINK_DOWN,
        FCOE_CREATE_LINK_UP,
};

/**
 * _fcoe_create() - (internal) Create a fcoe interface
 * @netdev  :   The net_device object the Ethernet interface to create on
 * @fip_mode:   The FIP mode for this creation
 * @link_state: The ctlr link state on creation
 *
 * Called from either the libfcoe 'create' module parameter
 * via fcoe_create or from fcoe_syfs's ctlr_create file.
 *
 * libfcoe's 'create' module parameter is deprecated so some
 * consolidation of code can be done when that interface is
 * removed.
 */
static int _fcoe_create(struct net_device *netdev, enum fip_mode fip_mode,
                        enum fcoe_create_link_state link_state)
{
        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;
                if (!fcoe->removed)
                        fcoe_interface_remove(fcoe);
                rtnl_unlock();
                fcoe_interface_cleanup(fcoe);
                mutex_unlock(&fcoe_config_mutex);
                fcoe_ctlr_device_delete(ctlr_dev);
                return rc;
        }

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

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

        /* start FIP Discovery and FLOGI */
        lport->boot_time = jiffies;
        fc_fabric_login(lport);

        /*
         * If the fcoe_ctlr_device is to be set to DISABLED
         * it must be done after the lport is added to the
         * hostlist, but before the rtnl_lock is released.
         * This is because the rtnl_lock protects the
         * hostlist that fcoe_device_notification uses. If
         * the FCoE Controller is intended to be created
         * DISABLED then 'enabled' needs to be considered
         * handling link events. 'enabled' must be set
         * before the lport can be found in the hostlist
         * when a link up event is received.
         */
        if (link_state == FCOE_CREATE_LINK_UP)
                ctlr_dev->enabled = FCOE_CTLR_ENABLED;
        else
                ctlr_dev->enabled = FCOE_CTLR_DISABLED;

        if (link_state == FCOE_CREATE_LINK_UP &&
            !fcoe_link_ok(lport)) {
                rtnl_unlock();
                fcoe_ctlr_link_up(ctlr);
                mutex_unlock(&fcoe_config_mutex);
                return rc;
        }

out_nodev:
        rtnl_unlock();
        mutex_unlock(&fcoe_config_mutex);

        return rc;
}

/**
 * fcoe_create() - Create a fcoe interface
 * @netdev  : The net_device object the Ethernet interface to create on
 * @fip_mode: The FIP mode for this creation
 *
 * Called from fcoe transport
 *
 * Returns: 0 for success
 */
static int fcoe_create(struct net_device *netdev, enum fip_mode fip_mode)
{
        return _fcoe_create(netdev, fip_mode, FCOE_CREATE_LINK_UP);
}

/**
 * fcoe_ctlr_alloc() - Allocate a fcoe interface from fcoe_sysfs
 * @netdev: The net_device to be used by the allocated FCoE Controller
 *
 * This routine is called from fcoe_sysfs. It will start the fcoe_ctlr
 * in a link_down state. The allows the user an opportunity to configure
 * the FCoE Controller from sysfs before enabling the FCoE Controller.
 *
 * Creating in with this routine starts the FCoE Controller in Fabric
 * mode. The user can change to VN2VN or another mode before enabling.
 */
static int fcoe_ctlr_alloc(struct net_device *netdev)
{
        return _fcoe_create(netdev, FIP_MODE_FABRIC,
                            FCOE_CREATE_LINK_DOWN);
}

/**
 * fcoe_link_ok() - Check if the link is OK for a local port
 * @lport: The local port to check link on
 *
 * Returns: 0 if link is UP and OK, -1 if not
 *
 */
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;
}

/**
 * fcoe_percpu_clean() - Clear all pending skbs for an local port
 * @lport: The local port whose skbs are to be cleared
 *
 * Must be called with fcoe_create_mutex held to single-thread completion.
 *
 * This flushes the pending skbs by flush the work item for each CPU. The work
 * item on each possible CPU is flushed because we may have used the per-CPU
 * struct of an offline CPU.
 */
static void fcoe_percpu_clean(struct fc_lport *lport)
{
        struct fcoe_percpu_s *pp;
        unsigned int cpu;

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

                flush_work(&pp->work);
        }
}

/**
 * fcoe_reset() - Reset a local port
 * @shost: The SCSI host associated with the local port to be reset
 *
 * Returns: Always 0 (return value required by FC transport template)
 */
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);
        struct fcoe_ctlr_device *cdev = fcoe_ctlr_to_ctlr_dev(ctlr);

        fcoe_ctlr_link_down(ctlr);
        fcoe_clean_pending_queue(ctlr->lp);

        if (cdev->enabled != FCOE_CTLR_DISABLED &&
            !fcoe_link_ok(ctlr->lp))
                fcoe_ctlr_link_up(ctlr);
        return 0;
}

/**
 * fcoe_hostlist_lookup_port() - Find the FCoE interface associated with a net device
 * @netdev: The net device used as a key
 *
 * Locking: Must be called with the RNL mutex held.
 *
 * Returns: NULL or the FCoE interface
 */
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;
}

/**
 * fcoe_hostlist_lookup() - Find the local port associated with a
 *                          given net device
 * @netdev: The netdevice used as a key
 *
 * Locking: Must be called with the RTNL mutex held
 *
 * Returns: NULL or the local port
 */
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;
}

/**
 * fcoe_hostlist_add() - Add the FCoE interface identified by a local
 *                       port to the hostlist
 * @lport: The local port that identifies the FCoE interface to be added
 *
 * Locking: must be called with the RTNL mutex held
 *
 * Returns: 0 for success
 */
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;
}

/**
 * fcoe_hostlist_del() - Remove the FCoE interface identified by a local
 *                       port to the hostlist
 * @lport: The local port that identifies the FCoE interface to be added
 *
 * Locking: must be called with the RTNL mutex held
 *
 */
static void fcoe_hostlist_del(const struct fc_lport *lport)
{
        struct fcoe_interface *fcoe;
        struct fcoe_port *port;

        port = lport_priv(lport);
        fcoe = port->priv;
        list_del(&fcoe->list);
        return;
}

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

/**
 * fcoe_init() - Initialize fcoe.ko
 *
 * Returns: 0 on success, or a negative value on failure
 */
static int __init fcoe_init(void)
{
        struct fcoe_percpu_s *p;
        unsigned int cpu;
        int rc = 0;

        fcoe_wq = alloc_workqueue("fcoe", WQ_PERCPU, 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");
                goto out_destroy;
        }

        mutex_lock(&fcoe_config_mutex);

        for_each_possible_cpu(cpu) {
                p = per_cpu_ptr(&fcoe_percpu, cpu);
                INIT_WORK(&p->work, fcoe_receive_work);
                skb_queue_head_init(&p->fcoe_rx_list);
                local_lock_init(&p->lock);
        }

        /* 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:
        mutex_unlock(&fcoe_config_mutex);
        fcoe_transport_detach(&fcoe_sw_transport);
out_destroy:
        destroy_workqueue(fcoe_wq);
        return rc;
}
module_init(fcoe_init);

/**
 * fcoe_exit() - Clean up fcoe.ko
 *
 * Returns: 0 on success or a  negative value on failure
 */
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) {
                ctlr = fcoe_to_ctlr(fcoe);
                port = lport_priv(ctlr->lp);
                fcoe_hostlist_del(port->lport);
                queue_work(fcoe_wq, &port->destroy_work);
        }
        rtnl_unlock();

        for_each_possible_cpu(cpu)
                fcoe_thread_cleanup_local(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);

/**
 * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler
 * @seq: active sequence in the FLOGI or FDISC exchange
 * @fp: response frame, or error encoded in a pointer (timeout)
 * @arg: pointer to the fcoe_ctlr structure
 *
 * This handles MAC address management for FCoE, then passes control on to
 * the libfc FLOGI response handler.
 */
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);
        else
                fcoe_update_src_mac(lport, mac);
done:
        fc_lport_flogi_resp(seq, fp, lport);
}

/**
 * fcoe_logo_resp() - FCoE specific LOGO response handler
 * @seq: active sequence in the LOGO exchange
 * @fp: response frame, or error encoded in a pointer (timeout)
 * @arg: pointer to the fcoe_ctlr structure
 *
 * This handles MAC address management for FCoE, then passes control on to
 * the libfc LOGO response handler.
 */
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);
}

/*
 * fcoe_elsct_send - FCoE specific ELS handler
 *
 * This does special case handling of FIP encapsualted ELS exchanges for FCoE,
 * using FCoE specific response handlers and passing the FIP controller as
 * the argument (the lport is still available from the exchange).
 *
 * Most of the work here is just handed off to the libfc routine.
 */
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);
}

/**
 * fcoe_vport_create() - create an fc_host/scsi_host for a vport
 * @vport: fc_vport object to create a new fc_host for
 * @disabled: start the new fc_host in a disabled state by default?
 *
 * Returns: 0 for success
 */
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;
}

/**
 * fcoe_vport_destroy() - destroy the fc_host/scsi_host for a vport
 * @vport: fc_vport object that is being destroyed
 *
 * Returns: 0 for success
 */
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);
        rtnl_lock();
        fcoe_if_destroy(vn_port);
        rtnl_unlock();
        mutex_unlock(&fcoe_config_mutex);

        return 0;
}

/**
 * fcoe_vport_remove() - remove attached vports
 * @lport: lport for which the vports should be removed
 */
static void fcoe_vport_remove(struct fc_lport *lport)
{
        struct Scsi_Host *shost;
        struct fc_host_attrs *fc_host;
        unsigned long flags;
        struct fc_vport *vport;
        struct fc_vport *next_vport;

        shost = lport->host;
        fc_host = shost_to_fc_host(shost);

        /* Loop through all the vports and mark them for deletion */
        spin_lock_irqsave(shost->host_lock, flags);
        list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
                if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
                        continue;
                } else {
                        vport->flags |= FC_VPORT_DELETING;
                        queue_work(fc_host_work_q(shost),
                                   &vport->vport_delete_work);
                }
        }
        spin_unlock_irqrestore(shost->host_lock, flags);

        flush_workqueue(fc_host_work_q(shost));
}

/**
 * fcoe_vport_disable() - change vport state
 * @vport: vport to bring online/offline
 * @disable: should the vport be disabled?
 */
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;
}

/**
 * fcoe_set_vport_symbolic_name() - append vport string to symbolic name
 * @vport: fc_vport with a new symbolic name string
 *
 * After generating a new symbolic name string, a new RSPN_ID request is
 * sent to the name server.  There is no response handler, so if it fails
 * for some reason it will not be retried.
 */
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_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);
}

/**
 * fcoe_set_port_id() - Callback from libfc when Port_ID is set.
 * @lport: the local port
 * @port_id: the port ID
 * @fp: the received frame, if any, that caused the port_id to be set.
 *
 * This routine handles the case where we received a FLOGI and are
 * entering point-to-point mode.  We need to call fcoe_ctlr_recv_flogi()
 * so it can set the non-mapped mode and gateway address.
 *
 * The FLOGI LS_ACC is handled by fcoe_flogi_resp().
 */
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);
}